toughie vs stumper

toughie and stumper both are nouns.

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

As nouns, toughie and stumper are synonyms defined as:

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

Other synonyms of toughie include poser, sticker.

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