solve vs understand

solve and understand both are verbs.

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

As verbs, understand is a hypernym of solve; that is, understand is a word with a broader meaning than solve:

solve: find the solution to (a problem or question) or understand the meaning of
understand: know and comprehend the nature or meaning of

solve (verb)	understand (verb)
find the solution to (a problem or question) or understand the meaning of	know and comprehend the nature or meaning of
find the solution	perceive (an idea or situation) mentally
settle, as of a debt	believe to be the case
	make sense of a language
	be understanding of