dissenter vs protester

dissenter and protester both are nouns.

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

As nouns, dissenter and protester are synonyms defined as:

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

Other synonyms of dissenter include contestant, dissident, objector.

dissenter (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