IMPOSTOR

n. one who pretends to be something he is not in order to deceive others, impersonator, pretender (also imposter)

An impostor is a person who pretends to be somebody else, often to try to gain financial or social advantages through social engineering, but just as often for purposes of espionage or law enforcement.Pretenders for various thrones used to be common. Numerous men claimed they were Dauphin, the heir to the French throne who disappeared during the French Revolution, and there were three false Dimitris who were serious pretenders for the throne of Russia. Very daring impostors may pretend to be someone else who really exists, although fast news media has made this rather difficult. Usually they just misrepresent their financial status, educational status, social status, family background or in some cases, their gender. Impostors are usually aware of not being who they say they are, however there are borderline cases who may have ended up believing their own tall tales. People may make false claims about their past or background without being full-blown impostors; non-existent military service seems common.
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Noun
1. a person who makes deceitful pretenses
(synonym) imposter, pretender, fake, faker, fraud, sham, shammer, pseudo, pseud, role player
(hypernym) deceiver, cheat, cheater, trickster, beguiler, slicker
(hyponym) name dropper

adj. sham, false, deceptive; pretended, feigned

n. impostor, shammer; sham, humbug

n. impostor, impersonator