maiden vs fille

maiden and fille both are nouns.

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

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

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

maiden (noun)	fille (noun)
an unmarried girl (especially a virgin)	a young female
(cricket) an over in which no runs are scored

maiden (adjective)	fille (adjective)
serving to set in motion