bar girl vs woman

bar girl and woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
bar girl	Yes	No	No	No
woman	Yes	No	No	No

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

Other hypernyms of bar girl include adult female.

bar 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