rara avis vs doer

rara avis and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
rara avis	Yes	No	No	No
doer	Yes	No	No	No

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

Other hypernyms of rara avis include actor, worker.

rara avis (noun)	doer (noun)
a rare or unique person	a person who acts and gets things done