(n.) One who imposes upon others; a person who assumes a character or title not his own, for the purpose of deception; a pretender.

ape beguiler blagueur bluff bluffer charlatan cheat clinquant con man confidence man conformist copier copycat copyist counterfeit counterfeiter cuckoo deceiver dissembler dissimulator dummy echo echoer echoist fake fakement faker flimflam man forger forgery fourflusher frame-up fraud hoax humbug hypocrite imitation imitator impersonator imposter junk malingerer mime mimer mimic mimicker misleader mock mocker mockingbird monkey mountebank parrot paste pettifogger phony pinchbeck plagiarist poll-parrot polly polly-parrot poser poseur pretender put-on put-up job quack quacksalver quackster ringer rip-off saltimbanco sham shammer shark sheep shoddy shyster simulacrum simulator swindle swindler tinsel trickster whited sepulcher