Negro vs doer

Negro and doer both are nouns.

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

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

Negro: a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today
doer: a person who acts and gets things done

Other hypernyms of Negro include actor, worker.

Negro (noun)	doer (noun)
a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today	a person who acts and gets things done