darky vs Negroid

darky and Negroid both are nouns.

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

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

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

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

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