The words compliment and complement sound exactly same but their meanings are totallydifferent. Here are some everyday examples that will help you in better understanding of boththe words.
Compliment as noun:
The word compliment is an expression used to praise or admire someone or something. Thesincere compliment of the stranger boosted Eric’s morale. Compliment is also defined by aceremonial act of courtesy or a regard which means she can send him her compliments and hecan receive her compliments.
Compliment as verb:
The most common use of the word compliment is as a verb where it is the action word. It canbe employed in present tense (third person); compliment, past tense; complimented, pastparticiple; complimented and present participle; complimenting. The meaning of thecompliment (verb) is same as that of noun i.e. presenting someone with a courteous remark.
In this example, complimented is used in the past tense and it describes the action of ‘praise’ for the manager taken by the company for his resilience.
Complement as noun:
Compliment’s homophone complement has a different origin and meaning. Complement isoriginally derived from a Latin word, complēmentum, which is something which completesanother thing. Complement is a character that contributes additional features to something insuch a way as to enhance or highlight its quality.
Compliment can also be used as a noun with a slightly different meaning which is a numericalvalue or a quantity without which something is incomplete. It is either of two parts required tomake something whole.
Complement as verb:
Complement when used as a verb imply the meaning of completeness or addition ofcharacteristics to make something better. In sentence formation, it can either be used with theobject or without the object. When used with object, the meaning is same as that describedbefore.
Note that this example makes use of the object i.e. dress which is signified by the subject andhas enhanced quality than before.Compliment is also used when subject does not require an object for its clarification. This iscalled ‘use without object’ and compliment was used without an object in the past.
This is the simplest way of using the word compliment, as it does not make use of the objectand is still meaningful. Although the usage of complement like this is an obsolete practice nowbut it make sense.
Compliment or Complement:
If someone passes you a good remark about your behavior, he is complimenting you (verbform). The teacher complimented Emma for her respectable behavior in class. And if youchoose something to enhance the quality of some other thing, you are complementing (verbform) one thing with another. A pair of spectacles complemented her official apparel.