deviate vs negate

deviate is a noun but negate is not a noun.

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

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

Other hyponyms of deviate include aberrate, aberrate, belie, contradict.

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

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

deviate (verb)	negate (verb)
turn aside; turn away from	make ineffective by counterbalancing the effect of
cause to turn away from a previous or expected course	prove negative; show to be false
be at variance with; be out of line with	deny the truth of
	be in contradiction with