noun
a person who does something, especially a person who does something morally or legally wrong
adjective
relating to or characteristic of a person who does something
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The doer of the crime was finally apprehended by the authorities.
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She's always the doer in our group projects, making sure everything gets done on time.
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He's a real doer, always getting things done no matter what.
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In the realm of creativity, she is the ultimate doer, constantly bringing new ideas to life.