untier vs actor

untier and actor both are nouns.

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

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

Other hypernyms of untier include doer, worker.

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