darky vs Black

darky and Black both are nouns.

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

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

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

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

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