dissent vs contradict

dissent is a noun but contradict is not a noun.

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

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

Other hyponyms of dissent include dissent, clash, contravene, negate.

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

Other hypernyms of dissent include controvert, oppose.

dissent (noun)	contradict (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

dissent (verb)	contradict (verb)
withhold assent	prove negative; show to be false
be of different opinions	deny the truth of
express opposition through action or words	be resistant to
	be in contradiction with