noun
or im·pos·ter ə̇mˈpästə(r)
( -s )
Etymology: Middle French & Late Latin; Middle French imposteur, from Late Latin impostor, from Latin impostus, impositus (past participle of imponere to put upon, impose, deceive, cheat) + -or — more at impose
: one that practices imposture : one that assumes an identity, character, or title not his own for the purpose of deception : pretender , fraud , humbug