darkey vs Black

darkey and Black both are nouns.

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

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

darkey: (ethnic slur) offensive term for Black people
Black: a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today

Other hypernyms of darkey include African-American, Negro, Negroid, Black person, blackamoor.

darkey (noun)	Black (noun)
(ethnic slur) offensive term for Black people	a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today
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	British chemist who identified carbon dioxide and who formulated the concepts of specific heat and latent heat (1728-1799)