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Synonyms for Impersonation (same or very similar meaning)

WordNet sense 1 (a representation of a person that is exaggerated for comic effect):
caricature, imitation

WordNet sense 2 (pretending to be another person):
imposture

WordNet sense 3 (imitating the mannerisms of another person):
personation


From the ODE community, based on WordNetadd/edit