dissident vs protester

dissident and protester both are nouns.

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

As nouns, dissident and protester are synonyms defined as:

dissident and protester: a person who dissents from some established policy

Other synonyms of dissident include contestant, dissenter, objector.

dissident (noun)	protester (noun)
a person who dissents from some established policy	someone who participates in a public display of group feeling
	a person who dissents from some established policy

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