Synonyms and related words :
ape, conformist, copier, copycat, copyist, counterfeiter, cuckoo, dissembler, dissimulator, echo, echoer, echoist, faker, forger, hypocrite, imitator, impersonator, impostor, mime, mimer, mimic, mimicker, mockingbird, monkey, parrot, phony, plagiarist, poll-parrot, polly, polly-parrot, poseur, sheep, simulator