stranger vs doer

stranger and doer both are nouns.

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

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

Other hypernyms of stranger include actor, worker.

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