girl vs fille

girl and fille both are nouns.

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

As nouns, girl and fille are synonyms defined as:

Other synonyms of girl include miss, missy, young lady, young woman.

girl (noun)	fille (noun)
a young female	a young female
a girl or young woman with whom a man is romantically involved
a youthful female person
a friendly informal reference to a grown woman
a female human offspring