noun
a person who copies the behavior or actions of another
adjective
relating to or characteristic of an imitator
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The artist accused the imitator of copying his work without permission.
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I can't believe that imitator is trying to pass off my jokes as his own!
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That imitator is such a copycat, always stealing other people's ideas.
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In the world of fashion, there are always imitators trying to replicate the latest trends.