stumper vs toughie

stumper and toughie both are nouns.

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

As nouns, stumper and toughie are synonyms defined as:

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

Other synonyms of stumper include poser, sticker.

stumper (noun)	toughie (noun)
a particularly difficult or baffling question or problem	a particularly difficult or baffling question or problem
	an aggressive and violent young criminal