monolingual vs actor

monolingual and actor both are nouns.

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

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

Other hypernyms of monolingual include doer, worker.

monolingual (noun)	actor (noun)
a person who knows only one language	a theatrical performer
	a person who acts and gets things done

monolingual (adjective)	actor (adjective)
using or knowing only one language