B-girl vs woman

B-girl and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
B-girl	Yes	No	No	No
woman	Yes	No	No	No

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

Other hypernyms of B-girl include adult female.

B-girl (noun)	woman (noun)
a woman employed by a bar to act as a companion to men customers	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