nigger vs Black person

nigger and Black person both are nouns.

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

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

nigger: (ethnic slur) extremely offensive name for a Black person
Black person: a person with dark skin who comes from Africa (or whose ancestors came from Africa)

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

nigger (noun)	Black person (noun)
(ethnic slur) extremely offensive name for a Black person	a person with dark skin who comes from Africa (or whose ancestors came from Africa)