objector vs actor

objector and actor both are nouns.

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

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

Other hypernyms of objector include doer, worker.

objector (noun)	actor (noun)
a person who dissents from some established policy	a theatrical performer
	a person who acts and gets things done