When you supplement, you add on some extra to something to make up for a lack in it.
A compliant person is readily willing to do what is asked of them.
When you comply with another's demands, you obey or yield to their wishes.
A complement to something else finishes it or brings it into a fuller state.
When someone implements something, such as a plan, they carry it out or perform it.
If you are complimentary towards someone, you say nice things to them, such as how intelligent they are or how beautiful they look.
When you accomplish something, such as a difficult task or long project, you are able to complete it or be successful in doing it.
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