Poser

n.

1.

One who, or that which, puzzles; a difficult or inexplicable question or fact.

Noun	1.	poser - a person who habitually pretends to be something he is not Synonyms: poseur
	2.	poser - a person who poses for a photographer or painter or sculptor; "the president didn't have time to be a model so the artist worked from photos" Synonyms: model
	3.	poser - a particularly difficult or baffling question or problem Synonyms: stumper, toughie, sticker

Chinese puzzle, Gordian knot, Holy Willie, Joseph Surface, Mawworm, Pecksniff, Pharisee, Tartuffe, affecter, attitudinarian, attitudinizer, baffling problem, blagueur, bluff, bluffer, brain twister, canter, canting hypocrite, charlatan, crossword puzzle, crux, dilemma, dissembler, dissimulator, enigma, enigmatic question, fake, faker, floorer, formalist, fourflusher, fraud, humbug, hypocrite, impersonator, impostor, jigsaw puzzle, knot, knotty point, lip server, lip worshiper, malingerer, mind-boggler, mountebank, mystery, node, nodus, nonplus, nut to crack, oxymoron, paradox, perplexed question, perplexity, pharisee, phony, pietist, pious fraud, pons asinorum, poseur, posture maker, posturer, posturist, pretender, problem, puzzle, puzzlement, puzzler, quack, quacksalver, quackster, quandary, question, question mark, ranter, religionist, religious hypocrite, ringer, saltimbanco, sham, shammer, sixty-four dollar question, sniveler, snuffler, spiritual humbug, sticker, striker of poses, stumper, teaser, tough proposition, vexed question, whited sepulcher, why