Black vs doer

Black and doer both are nouns.

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

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

Black: 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 Black include actor, worker.

Black (noun)	doer (noun)
a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today	a person who acts and gets things done
popular child actress of the 1930's (born in 1928)
British chemist who identified carbon dioxide and who formulated the concepts of specific heat and latent heat (1728-1799)