stumper vs sticker

stumper and sticker both are nouns.

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

As nouns, stumper and sticker are synonyms defined as:

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

Other synonyms of stumper include poser, toughie.

stumper (noun)	sticker (noun)
a particularly difficult or baffling question or problem	a short knife with a pointed blade used for piercing or stabbing
	an adhesive label
	a particularly difficult or baffling question or problem
	a small sharp-pointed tip resembling a spike on a stem or leaf