amateur vs actor

amateur and actor both are nouns.

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

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

Other hypernyms of amateur include doer, worker.

amateur (noun)	actor (noun)
someone who pursues a study or sport as a pastime	a theatrical performer
an athlete who does not play for pay	a person who acts and gets things done

amateur (adjective)	actor (adjective)
engaged in as a pastime
lacking professional skill or expertise