unfastener vs actor

unfastener and actor both are nouns.

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

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

Other hypernyms of unfastener include doer, worker.

unfastener (noun)	actor (noun)
a person who unfastens or unwraps or opens	a theatrical performer
	a person who acts and gets things done