Blog Grammar Rules Compliment vs Complement: What is the Difference?

Compliment vs Complement: What is the Difference?

Helly Douglas

Helly Douglas

UK Writer and Teacher

Published Sep 06, 2022


Sometimes it just takes one single letter to change the meaning of a whole word. Both compliment and complement come from the same Latin origin and are homophones.

This means they sound the same as each other but have different spellings. You will often see them being confused.

These words have very different meanings. Compliment is about courtesy. A compliment is admiration, praise or approval of someone.

Complement means to make something perfect or complete it.

Let’s look more closely at the difference between the two.

  1. What Is a Compliment?
  2. What Is a Complement?
  3. Common Homonyms
  4. Conclusion

What Is a Compliment?

Everyone loves to get a compliment. It is a way of showing praise or regard. Giving a compliment can be a formal act or a simple courtesy.

Compliments can also refer to getting something for free, such as a drink in a restaurant.

Compliments as Praise

Giving a compliment means praising or congratulating someone. You can compliment someone based on their achievements, how they look, or something they have done. When you give a compliment, you are being complimentary to someone.

For example:

  • She complimented my new suit.
  • They complimented her on her new job.
  • My teacher made complimentary comments about my essay.

When you give someone a compliment it is often called ‘paying a compliment’.

For example:

  • He paid me a compliment when he said my English grammar was excellent.
  • Tom is always paying me compliments about how I dress.

Compliments can be given by an individual or a group or organization.


Compliment Slips

Often companies will include a slip of paper called a ‘compliment slip’ with packages and letters they send out.

This simple piece of paper will show the name and address of the business along with the phrase ‘with compliments’. Space is left for a short, personalized message to be added.

These compliment slips are meant as a friendly way to communicate with customers and thank them for their business.

Compliments as Free Gifts

You might have heard the phrase ‘with the compliments of’ before. This means that something has been given free of charge. Another way of saying this is to use the adjective ‘complimentary’.

For example;

  • The drinks were free, with the compliments of the hotel.
  • The food at the event was complimentary.

The phrase can be used genuinely or sarcastically to mean 'thanks to', such as ‘my bad back is compliments of the small seats in the plane’.

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What Is a Complement?

A complement refers to things that work perfectly with each other. Complements make something complete. Often it is used to show things that go well together such as colors, musical instruments and clothes.

For example;

  • The violin is the perfect complement for the trumpet in this composition.
  • This creamy sauce complements the spicy meat.
  • That hat really complements your dress.

Complements often have specific definitions in different subjects such as science and mathematics, however, the meaning remains the same.

Complements in Science

The ‘complement system’ refers to the way proteins complement antibodies in your blood.

Complements in Art

In art, colors are often arranged in a circle called a ‘color wheel’. Complementary colors are those that are directly opposite from each other, such as green and red or blue and orange.

Complements in Economics


Complementary goods are items that work well with each other and could be sold together such as tennis racquets and tennis balls or hot dogs and hot dog buns.

Often you will see these items put close to each other in the store to encourage customers to buy both. The price of one of the complementary items affects the price of the other.

Complements in Mathematics

A complement in mathematics is the amount you need to add to complete something. For example, two angles that add up to 90 degrees are ‘complementary angles’.

Common Homonyms

There are lots of other homonyms in the English language. Remember, a homonym is two or more words that sound the same but have a different meaning. ‘Homonym’ is an overarching term that includes ‘homophones’ and some ‘homographs’.

Homophone: A word that is pronounced the same as another word but has a different meaning and a different spelling. Compliment / complement are examples of homophones.

Here are other common homophones:

  • There / their / they’re
  • Two / to / too
  • Weak / week
  • Meat / meet
  • Sun / son
  • See / sea

Homograph: A word that has the same spelling as another word but a different meaning. Some homographs are homonyms because they are pronounced the same. Others are called heteronyms because they are pronounced differently.

These words are all homographs that have the same pronunciation:

  • Bat: the animal / a piece of sporting equipment
  • Discount: reduce the price of something / to think something is not worthy of your consideration
  • Wave: the sea coming onto a beach / moving your hand to greet someone


Understanding the difference between compliment and complement is useful when reading and writing in English. They are easily confused because they sound the same but have very different meanings.

Compliment means giving praise to someone or something or giving a free gift as a token of your regard for them.

Complement means that something is complete or goes perfectly together.

If you are struggling with words that sound alike, try using ProWritingAid’s homonym report to help you catch and correct them in your writing. This will make sure you use the right word every time.

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Helly Douglas

Helly Douglas

UK Writer and Teacher

Helly Douglas is a UK writer and teacher, specialising in education, children, and parenting. She loves making the complex seem simple through blogs, articles, and curriculum content. You can check out her work at or connect on Twitter. When she’s not writing, you will find her in a classroom, being a mum or battling against the wilderness of her garden - the garden is winning!

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