Have you ever written an email to a company and wondered whether you should say “I want to complain” or “I want to make a complaint”? You are not alone.
This is one of the most common vocabulary mistakes made by English learners, students, and even professionals.
Although both words are related to expressing dissatisfaction, they have different grammatical functions. Complain is a verb, while complaint is a noun.
Using the wrong word can make your writing sound unnatural and grammatically incorrect.
In this guide, you will learn the exact difference between complain and complaint, their meanings, grammar rules, real-life examples, common mistakes, and professional usage.
Quick Answer
If you are short on time, here is the simple answer:
| Word | Part of Speech | When to Use It |
|---|---|---|
| 🟢 Complain | Verb | When describing the act of expressing dissatisfaction |
| 🔵 Complaint | Noun | When referring to the issue, report, or statement itself |
Correct Examples
✔ I want to complain about the poor service.
✔ She submitted a complaint to customer support.
✔ Customers complain when orders arrive late.
✔ The company received a formal complaint.
Incorrect Examples
✘ I want to complaint about the service.
✘ She submitted a complain to customer support.
✘ We complaint to the manager yesterday.
✘ The customer filed a complain.
What Does “Complain” Mean?
Complain is a verb. It describes the action of expressing dissatisfaction, frustration, annoyance, or concern about something.
Definition
To express unhappiness, dissatisfaction, or frustration about a person, service, product, situation, or experience.
How to Identify When to Use “Complain”
Ask yourself:
Am I describing an action?
If the answer is yes, use complain.
Sentence Formula
Subject + complain/complains/complained + about + issue
Examples in Different Tenses
Present Tense
- Customers complain when deliveries are delayed.
- Employees complain about poor communication.
Past Tense
- He complained about the noise all night.
- They complained to management last week.
Present Continuous
- She is complaining about the food again.
- Customers are complaining about service delays.
Present Perfect
- We have complained several times already.
- They have complained to the support team.
Infinitive Form
- I need to complain about this billing error.
- She wants to complain about the poor experience.
What Does “Complaint” Mean?
Complaint is a noun. It refers to the report, statement, issue, or expression of dissatisfaction itself.
Definition
A statement or formal report expressing that something is unsatisfactory, unfair, or unacceptable.
How to Identify When to Use “Complaint”
Ask yourself:
Am I talking about a thing, report, or issue?
If the answer is yes, use complaint.
Sentence Formula
Subject + verb + a/the complaint
Examples in Different Contexts
- The complaint was resolved quickly.
- She filed a complaint with customer support.
- My complaint was reviewed yesterday.
- The company received multiple complaints this month.
- The complaint was investigated by management.
The Key Grammatical Difference
The confusion between complain and complaint is not about meaning. Both words are connected to dissatisfaction. The real difference is grammar.
| Word | Type | Job in the Sentence | Answers This Question |
|---|---|---|---|
| 🟢 Complain | Verb | Describes an action | What is someone doing? |
| 🔵 Complaint | Noun | Names the issue or report | What is it called? |
Simple Rule
If someone is doing something, use complain.
If someone is referring to the issue itself, use complaint.
Examples:
✔ I want to complain.
✔ I filed a complaint.
✔ They complained yesterday.
✔ Their complaint was reviewed.
Easy Memory Trick
A simple way to remember the difference is this:
If you can place “a” or “the” before the word, use complaint.
✔ a complaint
✔ the complaint
✘ a complain
✘ the complain
If you need a word after “to”, use complain.
✔ to complain
✘ to complaint
This quick test works in most situations.
Using These Words in Professional Settings
These words are common in customer service, business communication, workplace discussions, and formal emails.
In Customer Service
✔ Customers complain about delayed deliveries.
✔ The support team received a complaint regarding a missing order.
✔ We will resolve your complaint within 48 hours.
✘ Customers complaint about delayed deliveries.
✘ We received a complain from a client.
In Business Emails
✔ I am writing to complain about a billing error.
✔ I would like to submit a formal complaint regarding your service.
In HR and Workplace Communication
✔ Several employees have complained about the new policy.
✔ HR is reviewing the complaint filed last week.
✔ Staff members can complain directly to management.
✘ Several employees have complaint about the policy.
✘ HR is reviewing the complain.
Common Mistakes and How to Fix Them
Mistake 1: Using “Complaint” as a Verb
❌ I want to complaint about the service.
✔ I want to complain about the service.
Mistake 2: Using “Complain” as a Noun
❌ She filed a complain with customer support.
✔ She filed a complaint with customer support.
Mistake 3: Wrong Word After Possessives
❌ My complain was ignored.
✔ My complaint was ignored.
Mistake 4: Mixing Action and Object
❌ The customer complaint to the manager.
✔ The customer complained to the manager.
Complain vs Complaint: Side-by-Side Comparison
| Using COMPLAIN (Verb) | Using COMPLAINT (Noun) |
|---|---|
| I complain about delays. | I filed a complaint about delays. |
| They complain frequently. | Their complaints are frequent. |
| She complained to the manager. | Her complaint reached management. |
| Customers complain about quality. | Customer complaints are increasing. |
| He likes to complain. | His complaints never stop. |
Related Word Forms
Understanding the complete word family makes it easier to remember the difference.
| Form | Word | Example |
|---|---|---|
| Base Verb | Complain | I complain when service is poor. |
| Third Person | Complains | She complains frequently. |
| Past Tense | Complained | They complained yesterday. |
| Present Participle | Complaining | He is complaining again. |
| Singular Noun | Complaint | The complaint was resolved. |
| Plural Noun | Complaints | We received many complaints. |
| Person (Noun) | Complainer | He is known as a complainer. |
Frequently Asked Questions
Is complain a noun or a verb?
Complain is a verb. It describes the action of expressing dissatisfaction.
Is complaint a noun or a verb?
Complaint is a noun. It refers to the report, issue, or statement itself.
Can I say “make a complain”?
No. The correct phrase is make a complaint.
Which word is more formal?
Both words are formal, but complaint is more common in legal, business, and official documents.
Can complaint be used as a verb?
No. Standard English uses complaint only as a noun.
What is the past tense of complain?
The past tense is complained.
How can I remember the difference?
If you can place “a” or “the” before it, use complaint. If it describes an action, use complain.
Is “customer complaint” correct?
Yes. Customer complaint is a common phrase in business and customer service communication.
Conclusion
The difference between complain and complaint is simple once you understand their grammatical roles.
Complain is a verb that describes the action of expressing dissatisfaction, while complaint is a noun that refers to the issue, report, or statement itself.
Although both words share the same core meaning, they cannot be used interchangeably.By learning this distinction and practicing with real examples, you can write more clearly and professionally in emails,
workplace communication, customer service interactions, and everyday English. Remember: if it is an action, use complain; if it is a thing, use complaint.
