differ vs deviate

differ is not a noun while deviate is a noun.

Word	Noun	Adjective	Verb	Adverb
differ	No	No	Yes	No
deviate	Yes	Yes	Yes	No

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

Other hyponyms of differ include depart, diverge, vary, vary, contrast, counterpoint.

differ (noun)	deviate (noun)
	a person whose behavior deviates from what is acceptable especially in sexual behavior

differ (adjective)	deviate (adjective)
	markedly different from an accepted norm

differ (verb)	deviate (verb)
be of different opinions	turn aside; turn away from
be different	cause to turn away from a previous or expected course
	be at variance with; be out of line with