nigger vs Negroid

nigger and Negroid both are nouns.

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

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

nigger: (ethnic slur) extremely offensive name for a Black person
Negroid: a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today

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

nigger (noun)	Negroid (noun)
(ethnic slur) extremely offensive name for a Black person	a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today