Phoney
Part of speech: noun
Definition: A person who assumes an identity or quality other than their own. A person who professes beliefs or opinions that he or she does not hold.
Part of speech: adjective
Definition: 1900 Fraudulent; fake; having a misleading appearance.
Pretender
Part of speech: noun
Definition: A person who professes beliefs and opinions that he or she does not hold.A claimant to an abolished or already occupied throne.