rise up vs dissent

rise up is not a noun while dissent is a noun.

Word	Noun	Adjective	Verb	Adverb
rise up	No	No	Yes	No
dissent	Yes	No	Yes	No

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

Other hypernyms of rise up include protest, resist.

rise up (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

rise up (verb)	dissent (verb)
come to the surface	withhold assent
stand up on the hind legs, of quadrupeds	be of different opinions
take part in a rebellion; renounce a former allegiance	express opposition through action or words