stranger vs actor

stranger and actor both are nouns.

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

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

Other hypernyms of stranger include doer, worker.

stranger (noun)	actor (noun)
anyone who does not belong in the environment in which they are found	a theatrical performer
an individual that one is not acquainted with	a person who acts and gets things done