dissident vs contestant

dissident and contestant both are nouns.

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

As nouns, dissident and contestant are synonyms defined as:

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

Other synonyms of dissident include dissenter, objector, protester.

dissident (noun)	contestant (noun)
a person who dissents from some established policy	a person who participates in competitions
	a person who dissents from some established policy

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