disagree vs clash

disagree is not a noun while clash is a noun.

Word	Noun	Adjective	Verb	Adverb
disagree	No	No	Yes	No
clash	Yes	No	Yes	No

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

Other hyponyms of disagree include dissent, contradict, contravene, negate.

disagree (noun)	clash (noun)
	a minor short-term fight
	a loud resonant repeating noise
	a state of conflict between persons
	a state of conflict between colors

disagree (verb)	clash (verb)
be of different opinions	disagree violently
be different from one another	crash together with violent impact
	be incompatible; be or come into conflict