stumper vs poser

stumper and poser both are nouns.

Word	Noun	Adjective	Verb	Adverb
stumper	Yes	No	No	No
poser	Yes	No	No	No

As nouns, stumper and poser are synonyms defined as:

stumper and poser: a particularly difficult or baffling question or problem

Other synonyms of stumper include sticker, toughie.

stumper (noun)	poser (noun)
a particularly difficult or baffling question or problem	a particularly difficult or baffling question or problem
	a person who poses for a photographer or painter or sculptor
	a person who habitually pretends to be something he is not