Negress vs Negroid

Negress and Negroid both are nouns.

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

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

Negress: a Black woman or girl
Negroid: a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today

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

Negress (noun)	Negroid (noun)
a Black woman or girl	a person with African ancestry, "Negro" and "Negroid" are archaic and pejorative today