pretender

n. one who puts up a false appearance, one who feigns; impersonator; one who asserts, claimant; one who claims succession to the crown

A pretender is a claimant to an abolished throne or to a throne already occupied by somebody else. The English word comes from the French word prétendre, meaning "to put forward, to profess or claim". The papal equivalent of a pretender is an antipope.
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Noun
1. a claimant to the throne or to the office of ruler (usually without just title)
(hypernym) claimant
(derivation) pretend

Noun
1. a person who makes deceitful pretenses
(synonym) imposter, impostor, fake, faker, fraud, sham, shammer, pseudo, pseud, role player
(hypernym) deceiver, cheat, cheater, trickster, beguiler, slicker
(hyponym) name dropper
(derivation) dissemble, pretend, act
2. a person who professes beliefs and opinions that he does not hold
(synonym) hypocrite, dissembler, phony, phoney
(hypernym) deceiver, cheat, cheater, trickster, beguiler, slicker
(hyponym) smoothie, smoothy, sweet talker, charmer

v. purport, pretend; profess, allege, claim

v. pretend, contend; mean; intend, purpose; seek, want