Complaint vs. Complain: Meaning, Differences, Grammar and Examples

Complaint vs. Complain explains the difference between a noun and a verb, helping you choose the correct word and avoid common grammatical mistakes.

The word complaint is a noun that names a concern, grievance, or expression of dissatisfaction. The word complain is a verb that describes the act of expressing dissatisfaction. For example, “I have a complaint” is correct, but “I have a complain” is grammatically incorrect. Nouns name things, while verbs describe actions. This simple rule makes the difference easier to understand and helps prevent a grammatical mix-up.

In everyday conversations and everyday talk, these words can trip people up because they sound similar. You might file a complaint about poor customer service at a restaurant or complain to a manager about a delayed order. Both expressions communicate dissatisfaction, but each word serves a different grammatical role. Understanding their meanings, grammar rules, sentence patterns, and practical uses helps you choose the right word in workplace emails, formal writing, and casual discussions. Resources from TwominEnglish, including topics about same-difference and confidance-vs-confidence, can help learners build confidence in their English language skills and improve word choice.

In English grammar, look at the role a word plays in a sentence. Use complaint when you need a noun, as in “The customer submitted a complaint.” Use complain when you need a verb, as in “The customer decided to complain about the service.” These examples support clearer communication and help you use English effectively. You can express dissatisfaction without making your message sound unnatural by selecting the correct noun or verb form. Whether you are expressing dissatisfaction at a restaurant or filing a formal grievance at work, explain your concern clearly so the reader understands the problem.

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Quick Answer: Complaint vs. Complain

Complaint is a noun, while complain is a verb. Both words relate to dissatisfaction, but you use them differently in a sentence.

Complaint (noun): An expression of dissatisfaction, a grievance, or a reported problem.
Complain (verb): To express dissatisfaction, annoyance, discomfort, or pain.

Consider these examples:

Correct: I submitted a complaint about the broken product.
Correct: I decided to complain about the broken product.
Incorrect: I submitted a complain about the broken product.
Incorrect: I decided to complaint about the broken product.

Here’s a simple memory trick: You make or file a complaint, but you complain about something. Remembering this distinction will help you use both words correctly.

What Does Complaint Mean?

Complaint is a noun that refers to an expression of dissatisfaction, a grievance, or a problem someone reports. It can describe anything from a minor annoyance to a serious concern that requires official attention.

For instance, if a restaurant serves you cold food, you might make a complaint to the manager. If a customer reports a defective product to a company, the company may record that report as a complaint.

The word also appears in medical, legal, and administrative settings. A patient may describe a symptom as a complaint, while a person involved in a legal dispute may submit a formal complaint.

Common Uses of Complaint

The meaning of complaint depends on the situation. Here are the most common contexts.

Customer service: A customer submits a complaint about a damaged item.
Workplace: An employee files a complaint about unfair treatment.
Everyday life: A neighbor makes a complaint about loud music.
Healthcare: A patient reports a complaint of persistent pain.
Legal proceedings: A person files a formal complaint alleging wrongdoing.

Although these examples involve different situations, the word always functions as a noun. It names the concern or the act of formally expressing dissatisfaction.

Complaint in Example Sentences

The following examples show how to use complaint naturally in different contexts.

I have a complaint about the service I received yesterday.
The company received several complaints about its delivery times.
She filed a formal complaint with the human resources department.
His main complaint was the lack of communication.
The restaurant manager handled the customer’s complaint politely.
The patient described chest discomfort as the main reason for seeking medical attention.

Notice that you can place words such as a, the, my, or several before complaint. These words help identify it as a noun.

What Is the Difference Between a Personal and Formal Complaint?

A personal complaint usually involves an everyday problem or an expression of dissatisfaction. A formal complaint follows an established process and may require written documentation.

For example, telling a friend that your internet connection keeps dropping is an informal complaint. Submitting a written report to your internet provider about repeated service failures is a formal complaint.

The distinction matters because a formal complaint may trigger an investigation, a response deadline, or a specific procedure. However, the word complaint remains a noun in both situations.

What Does Complain Mean?

Complain is a verb that means to express dissatisfaction, annoyance, discomfort, or concern about something. It describes what a person does rather than naming the concern itself.

You might complain when a flight gets delayed, a product arrives damaged, or a coworker repeatedly misses deadlines. The word can describe a reasonable objection or repeated expressions of frustration. Its tone depends on the situation and how the speaker delivers the message.

According to the Cambridge Dictionary’s definition of complain, the verb can describe expressing dissatisfaction or formally telling someone that something is wrong. It also appears in contexts involving physical pain or discomfort.

Common Uses of Complain

The verb complain appears in several everyday situations.

Customer service: Customers complain when a company delivers poor service.
Workplace: Employees complain about unreasonable workloads or unclear instructions.
Daily life: People complain about traffic, noise, or bad weather.
Healthcare: Patients complain of headaches, stomach pain, or other symptoms.
Formal communication: Residents complain to local authorities about persistent problems.

For example, consider this sentence: Several customers complained about the restaurant’s slow service.

Here, complained describes what the customers did. It doesn’t name a document or report.

Complain in Example Sentences

These examples show how to use complain in different situations.

I don’t want to complain, but the room is too cold.
She complains about the traffic every morning.
The employees complained about the sudden schedule change.
He complained to the manager about the incorrect bill.
Several residents complained that the music was too loud.
The patient complained of severe stomach pain.

Notice that the verb changes according to the sentence’s tense and subject. You can say I complain, she complains, or they complained. Each form describes the same basic action.

Complaint vs. Complain: Key Differences

The biggest difference between complaint vs. complain is their part of speech. One names a concern, while the other describes an action.

Feature	Complaint	Complain
Part of speech	Noun	Verb
Basic meaning	An expression of dissatisfaction or a reported problem	To express dissatisfaction or report discomfort
Common question	What is the concern?	What does someone do?
Common patterns	Make a complaint, file a complaint, receive a complaint	Complain about something, complain to someone
Singular or plural	Complaint, complaints	Not applicable in the same way
Verb forms	No verb tenses	Complain, complains, complained, complaining
Example	I have a complaint.	I want to complain.

Both words express related ideas, but their grammatical roles differ. You cannot replace one with the other without changing the sentence structure.

Compare Complaint and Complain in Similar Sentences

Looking at paired examples makes the distinction easier to remember.

Example one: Customer service

Noun: The customer made a complaint about the damaged package.
Verb: The customer complained about the damaged package.

Example two: Workplace

Noun: Her complaint concerned the unfair workload.
Verb: She complained about the unfair workload.

Example three: Noise

Noun: The neighbor submitted a complaint about the noise.
Verb: The neighbor complained about the noise.

Each pair communicates a similar message. The noun names the concern, while the verb describes the act of expressing it.

Grammar Rules for Complaint and Complain

Understanding a few basic grammar rules will help you choose the correct word without second-guessing yourself.

How to Use Complaint as a Noun

A noun names a person, place, thing, or idea. In this case, complaint names an expression of dissatisfaction or a reported concern.

You can use it as a subject, a direct object, or the object of a preposition.

Subject: The complaint reached the department manager.
Direct object: I submitted a complaint yesterday.
Object of a preposition: The manager responded to my complaint.

You can also use complaint with articles, possessive words, and descriptive adjectives.

A complaint
The complaint
My complaint
A formal complaint
Several complaints

Because complaint is a countable noun in these common senses, you can refer to one complaint or multiple complaints.

For example, The company received three complaints about its billing system.

How to Use Complain as a Verb

A verb describes an action or state. The verb complain changes form according to the subject, tense, and sentence structure.

Here are its main forms:

Verb form	When to use it	Example
Complain	Base form	I complain when necessary.
Complains	Present tense with he, she, or it	She complains about the noise.
Complained	Simple past tense	They complained yesterday.
Complaining	Present participle or gerund	He is complaining again.
Complained	Past participle	She has complained before.

Pay attention to subject-verb agreement. In the simple present tense, use complains with a third-person singular subject.

Correct: He complains about the service.
Incorrect: He complain about the service.

The past tense is complained, not complaint. For example, write I complained to the manager yesterday when describing a past action.

Common Prepositions Used With Complain

The verb complain often appears with prepositions. Each construction communicates a slightly different relationship.

Expression	Meaning	Example
Complain about	Identify the subject of dissatisfaction	They complained about the delay.
Complain to	Identify the person or organization receiving the concern	She complained to the supervisor.
Complain of	Report pain, symptoms, or discomfort	He complained of a headache.
Complain that	Introduce a statement explaining the concern	They complained that the room was dirty.

These patterns are useful in both conversation and formal writing.

For instance, She complained to the manager about the service identifies the recipient and the subject of dissatisfaction. Meanwhile, She complained that the service was slow presents the concern as a complete statement.

Complaint, Complaints, Complain, and Complained

These four words belong to the same word family, but they don’t serve the same grammatical purpose.

Complaint: The singular noun.
Complaints: The plural noun.
Complain: The base form of the verb.
Complained: The past tense and past participle of the verb.

Consider these examples:

I have a complaint about the service. Other customers have complaints too. I plan to complain to the manager because several people complained yesterday.

This short example demonstrates all four forms in a natural context.

Is Complaining a Noun or a Verb?

Complaining can function as a verb form or a gerund, depending on its role in the sentence.

As part of a verb phrase, it describes an ongoing action:

The customer is complaining about the refund.

As a gerund, it functions like a noun:

Constant complaining can make teamwork difficult.

Although complaining can function as a noun-like gerund, it doesn’t replace complaint in every sentence. You would still say I have a complaint, not I have a complaining.

What Does Complainer Mean?

A complainer is a person who complains. The word is a noun, but it refers to the person rather than the concern.

For example:

Everyone considered Mark a constant complainer because he criticized every small change.

The word can sound negative or judgmental. In professional communication, employee who raised a concern may sound more neutral when you want to describe someone’s actions without criticizing their character.

Common Mistakes When Using Complaint vs. Complain

Even a small spelling difference can change a sentence’s grammatical meaning. These common mistakes are easy to avoid once you learn the correct patterns.

Incorrect sentence	Correct sentence	Explanation
I have a complain.	I have a complaint.	The sentence requires a noun.
I want to complaint.	I want to complain.	The base form of a verb follows to.
She complaint every day.	She complains every day.	The sentence requires a present-tense verb.
They filed a complain.	They filed a complaint.	Filed takes a noun as its object here.
He made a complain about the food.	He made a complaint about the food.	The phrase requires a noun.
She complained the noise.	She complained about the noise.	Use about to introduce the subject of dissatisfaction.

Mistake: Using Complaint After “Want To”

One frequent error is writing I want to complaint about the service.

The correct sentence is I want to complain about the service.

Why? In this construction, to introduces an infinitive verb. Since complaint is a noun, it doesn’t fit the required grammatical pattern.

The same rule applies to other verbs that take an infinitive:

I need to complain.
She plans to complain.
They decided to complain.

Mistake: Using Complain After “A” or “My”

Another common error is writing I have a complain or My complain was ignored.

The correct versions are I have a complaint and My complaint was ignored.

The article a and the possessive word my introduce a noun in these sentences. Therefore, complaint is the correct choice.

Complaint vs. Complain in Professional and Formal Writing

Choosing the right word matters when you write workplace emails, customer service messages, or official reports. Both words work in professional settings, but they serve different purposes.

Use complaint when referring to a concern, written report, or formal grievance.

For example:

I am writing to submit a formal complaint regarding the incorrect charges on my account.

Use complain when describing the action of raising a concern.

For example:

Several customers complained about the incorrect charges on their accounts.

The noun often works well when you want to identify a specific issue. The verb works well when you want to explain what someone did.

A Practical Workplace Example

Imagine an employee who repeatedly receives last-minute schedule changes.

The employee might write:

I would like to raise a complaint about the repeated changes to my work schedule.

Alternatively, the employee could write:

I would like to complain about the repeated changes to my work schedule.

Both sentences are grammatically correct. However, raise a complaint emphasizes the concern being formally presented, while complain emphasizes the act of expressing dissatisfaction.

For a professional message, the wording should remain clear and respectful. Explaining the problem and providing relevant details usually works better than using emotional or accusatory language.

Complaint vs. Complain in Everyday Conversation

In everyday English, both words appear naturally in conversations with friends, family, coworkers, and service providers.

The choice depends on what you want to say.

I have a complaint about this movie. You are naming a concern.
I want to complain about this movie. You are describing an action you intend to take.
Stop complaining about the weather. You are referring to an ongoing action.
His only complaint was the long wait. You are identifying the specific issue.

Neither word is automatically more polite than the other. Tone, context, and the rest of the sentence determine how your message sounds.

For example, I have a small complaint about the order may sound measured and specific. Meanwhile, I’m going to complain about everything could sound frustrated or exaggerated.

Complaint vs. Complain: A Simple Memory Trick

You don’t need to memorize complicated grammar terminology to remember the difference. Focus on the job each word performs.

Complaint is the thing. Complain is the action.

Think about a customer who receives the wrong product.

The customer makes a complaint.
The customer complains to the seller.
The seller receives the complaint.
The seller responds after the customer complains.

Another useful trick is to check the words surrounding the target word.

If the sentence contains a complaint, my complaint, or several complaints, you’re using the noun. If the sentence describes what someone does, such as complain, complains, or complained, you’re using the verb.

When you’re unsure, try replacing the word with report or express dissatisfaction. If the sentence needs a thing or report, use complaint. If it describes the action of expressing dissatisfaction, use complain.

Practice: Complaint vs. Complain

Test your understanding with these five fill-in-the-blank questions. Choose the correct form for each sentence.

I want to ______ about the delayed delivery.
The manager received a formal ______ yesterday.
She often ______ about the office temperature.
Several customers filed ______ about the new billing policy.
He ______ to the supervisor last week.

Answer Key

Complain — The phrase want to takes the base form of a verb.
Complaint — The sentence needs a singular noun.
Complains — The subject she takes the third-person singular present form.
Complaints — The plural noun follows filed.
Complained — The phrase refers to a completed action in the past.

If you answered all five correctly, you’ve grasped the central distinction between these words.

Complaint vs. Complain at a Glance

Category	Complaint	Complain
Part of speech	Noun	Verb
Meaning	An expression of dissatisfaction or a reported concern	To express dissatisfaction
Correct example	I have a complaint.	I want to complain.
Common phrase	Make a complaint	Complain about something
Past form	No verb tense	Complained
Plural or related form	Complaints	Complains, complaining
Memory trick	The concern or report	The action of expressing concern

FAQs:

Is complaint a noun or a verb?

Complaint is a noun. It refers to an expression of dissatisfaction, a grievance, or a reported problem.

Example: The company investigated my complaint.

Is complain a noun or a verb?

Complain is a verb. It describes the action of expressing dissatisfaction, annoyance, or discomfort.

Example: Customers complain when their orders arrive late.

Should I say “make a complaint” or “complain”?

Both expressions are correct, but their grammatical structures differ.

I made a complaint about the service.
I complained about the service.

The first uses a noun. The second uses a verb.

What is the difference between “complain about” and “complaint about”?

Complain about is a verb phrase that describes expressing dissatisfaction with something. Complaint about is a noun phrase that identifies the concern.

For example, She complained about the delay describes an action, while Her complaint about the delay was justified names the concern.

Is “I have a complain” grammatically correct?

No. In standard English, the correct expression is “I have a complaint.” The word complain is a verb and cannot replace the noun in this sentence.

What is the plural of complaint?

The plural of complaint is complaints.

Example: The company received several complaints from customers.

What is the past tense of complain?

The past tense of complain is complained.

Example: He complained about the poor service yesterday.

Conclusion:

Understanding the difference between complaint vs. complain helps you write clearly and avoid common grammar mistakes. Complaint is a noun that refers to a concern, grievance, or expression of dissatisfaction. Complain is a verb that describes the act of expressing dissatisfaction, annoyance, or discomfort.

For example, you can make a complaint about poor service or complain to the manager about poor service. Both expressions are correct, but each uses a different grammatical structure. Remember this simple rule: a complaint is something you make or file, while complain is something you do. Apply this distinction in everyday conversations, professional emails, and formal writing to communicate your message naturally and confidently.