solve vs guess

solve is not a noun while guess is a noun.

Word	Noun	Adjective	Verb	Adverb
solve	No	No	Yes	No
guess	Yes	No	Yes	No

As verbs, guess is a hyponym of solve; that is, guess is a word with a more specific, narrower meaning than solve:

solve: find the solution to (a problem or question) or understand the meaning of
guess: guess correctly; solve by guessing

Other hyponyms of solve include answer, resolve, riddle, strike, infer, answer, break.

solve (noun)	guess (noun)
	an estimate based on little or no information
	a message expressing an opinion based on incomplete evidence

solve (verb)	guess (verb)
find the solution to (a problem or question) or understand the meaning of	expect, believe, or suppose
find the solution	judge tentatively or form an estimate of (quantities or time)
settle, as of a debt	guess correctly; solve by guessing
	put forward, of a guess, in spite of possible refutation