opposer vs actor

opposer and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
opposer	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of opposer; that is, actor is a word with a broader meaning than opposer:

Other hypernyms of opposer include doer, worker.

opposer (noun)	actor (noun)
someone who offers opposition	a theatrical performer
	a person who acts and gets things done