geisha girl vs woman

geisha girl and woman both are nouns.

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

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

geisha girl: a Japanese woman trained to entertain men with conversation and singing and dancing
woman: an adult female person (as opposed to a man)

Other hypernyms of geisha girl include Japanese, Nipponese, adult female.

geisha girl (noun)	woman (noun)
a Japanese woman trained to entertain men with conversation and singing and dancing	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