darkey vs Black person

darkey and Black person both are nouns.

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

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

darkey: (ethnic slur) offensive term for Black people
Black person: a person with dark skin who comes from Africa (or whose ancestors came from Africa)

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

darkey (noun)	Black person (noun)
(ethnic slur) offensive term for Black people	a person with dark skin who comes from Africa (or whose ancestors came from Africa)