rare bird vs actor

rare bird and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
rare bird	Yes	No	No	No
actor	Yes	No	No	No

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

Other hypernyms of rare bird include doer, worker.

rare bird (noun)	actor (noun)
a rare or unique person	a theatrical performer
	a person who acts and gets things done