party girl vs fille

party girl and fille both are nouns.

Word	Noun	Adjective	Verb	Adverb
party girl	Yes	No	No	No
fille	Yes	No	No	No

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

party girl: an attractive young woman hired to attend parties and entertain men
fille: a young female

Other hypernyms of party girl include girl, miss, missy, young lady, young woman.

party girl (noun)	fille (noun)
an attractive young woman hired to attend parties and entertain men	a young female