protester vs dissenter

protester and dissenter both are nouns.

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

As nouns, protester and dissenter are synonyms defined as:

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

Other synonyms of protester include contestant, dissident, objector.

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