cypher vs solve

cypher is a noun but solve is not a noun.

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

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

cypher (noun)	solve (noun)
a secret method of writing
a message written in a secret code
a person of no influence
a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential
a mathematical element that when added to another number yields the same number

cypher (verb)	solve (verb)
make a mathematical calculation or computation	find the solution to (a problem or question) or understand the meaning of
convert ordinary language into code	find the solution
	settle, as of a debt