noun
a person who pretends to be someone else, especially for entertainment or fraud purposes
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The police arrested the impersonator who was pretending to be a doctor at the hospital.
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I heard there's an impersonator doing a comedy show at the club tonight.
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That impersonator at the party was so good, I almost believed he was the real celebrity.
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She's an impersonator of emotions, always putting on a facade to hide her true feelings.