ostrich vs doer

ostrich and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
ostrich	Yes	No	No	No
doer	Yes	No	No	No

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

ostrich: a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)
doer: a person who acts and gets things done

Other hypernyms of ostrich include actor, worker.

ostrich (noun)	doer (noun)
fast-running African flightless bird with two-toed feet; largest living bird	a person who acts and gets things done
a person who refuses to face reality or recognize the truth (a reference to the popular notion that the ostrich hides from danger by burying its head in the sand)