digress vs deviate

digress is not a noun while deviate is a noun.

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

As verbs, deviate is a hypernym of digress; that is, deviate is a word with a broader meaning than digress:

Other hypernyms of digress include divert.

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

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

digress (verb)	deviate (verb)
lose clarity or turn aside especially from the main subject of attention or course of argument in writing, thinking, or speaking	turn aside; turn away from
wander from a direct or straight course	cause to turn away from a previous or expected course
	be at variance with; be out of line with