Black woman vs woman

Black woman and woman both are nouns.

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

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

Other hypernyms of Black woman include African-American, Black, Negro, Negroid, adult female, Black person, blackamoor.

Black woman (noun)	woman (noun)
a woman who is Black	women as a class
	an adult female person (as opposed to a man)
	a female person who plays a significant role (wife or mistress or girlfriend) in the life of a particular man