Nouns

(n)fake, sham, postichesomething that is a counterfeit; not what it seems to be
(n)imposter, impostor, pretender, fake, faker, fraud, sham, shammer, pseudo, pseud, role playera person who makes deceitful pretenses
(n)juke, fake(football) a deceptive move made by a football player

Verbs

(v)forge, fake, counterfeitmake a copy of with the intent to deceive“he faked the signature”, “they counterfeited dollar bills”, “She forged a Green Card”
(v)fudge, manipulate, fake, falsify, cook, wangle, misrepresenttamper, with the purpose of deception“Fudge the figures”, “cook the books”, “falsify the data”
(v)talk through one's hat, bullshit, bull, fakespeak insincerely or without regard for facts or truths“The politician was not well prepared for the debate and faked it”

Adjectives

(s)bogus, fake, phony, phoney, bastardfraudulent; having a misleading appearance
(s)fake, false, faux, imitation, simulatednot genuine or real; being an imitation of the genuine article“it isn't fake anything; it's real synthetic fur”, “faux pearls”, “false teeth”, “decorated with imitation palm leaves”, “a purse of simulated alligator hide”