negate vs dissent

negate is not a noun while dissent is a noun.

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

As verbs, dissent is a hypernym of negate; that is, dissent is a word with a broader meaning than negate:

Other hypernyms of negate include differ, disagree, take issue.

negate (noun)	dissent (noun)
	the act of protesting; a public (often organized) manifestation of dissent
	(law) the difference of one judge's opinion from that of the majority
	a difference of opinion

negate (verb)	dissent (verb)
make ineffective by counterbalancing the effect of	withhold assent
prove negative; show to be false	be of different opinions
deny the truth of	express opposition through action or words
be in contradiction with