poser
(noun)
noun
1. a person who habitually pretends to be something he is not
Similar word(s): poseur
Definition categories: person, exhibitionist
2. a person who poses for a photographer or painter or sculptor
Similar word(s): model
Definition categories: person, assistant, help, helper, supporter
3. a particularly difficult or baffling question or problem
Similar word(s): sticker, stumper, toughie
Definition categories: communication, problem