B-girl vs bar girl

B-girl and bar girl both are nouns.

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

As nouns, B-girl and bar girl are synonyms defined as:

B-girl and bar girl: a woman employed by a bar to act as a companion to men customers

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