dissent vs walkout

dissent and walkout both are nouns.

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

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

dissent: the act of protesting; a public (often organized) manifestation of dissent
walkout: the act of walking out (of a meeting or organization) as a sign of protest

Other hyponyms of dissent include boycott, direct action, demonstration, manifestation.

dissent (noun)	walkout (noun)
the act of protesting; a public (often organized) manifestation of dissent	a strike in which the workers walk out
(law) the difference of one judge's opinion from that of the majority	the act of walking out (of a meeting or organization) as a sign of protest
a difference of opinion

dissent (verb)	walkout (verb)
withhold assent
be of different opinions
express opposition through action or words