geisha vs geisha girl

geisha and geisha girl both are nouns.

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

As nouns, geisha and geisha girl are synonyms defined as:

geisha and geisha girl: a Japanese woman trained to entertain men with conversation and singing and dancing

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