first-rater vs actor

first-rater and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
first-rater	Yes	No	No	No
actor	Yes	No	No	No

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

Other hypernyms of first-rater include doer, worker.

first-rater (noun)	actor (noun)
one who is first-rate	a theatrical performer
	a person who acts and gets things done