dissident vs CO

dissident and CO both are nouns.

Word	Noun	Adjective	Verb	Adverb
dissident	Yes	Yes	No	No
CO	Yes	No	No	No

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

Other hyponyms of dissident include conscientious objector, nonconformist, recusant, political dissident, NIMBY.

dissident (noun)	CO (noun)
a person who dissents from some established policy	a state in west central United States in the Rocky Mountains
	one who refuses to serve in the armed forces on grounds of conscience
	an odorless very poisonous gas that is a product of incomplete combustion of carbon

dissident (adjective)	CO (adjective)
disagreeing, especially with a majority
characterized by departure from accepted beliefs or standards