pretender

(noun) a claimant to the throne or to the office of ruler (usually without just title). Synonyms: Pretender.

(noun) a person who makes deceitful pretenses. Synonyms: imposter, impostor, fake, faker, fraud, sham, shammer, pseudo, pseud, role player.

(noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives. Synonyms: hypocrite, dissembler, dissimulator, phony, phoney.