maid vs girl

maid and girl both are nouns.

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

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

Other hypernyms of maid include fille, miss, missy, young lady, young woman.

maid (noun)	girl (noun)
an unmarried girl (especially a virgin)	a young female
a female domestic	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