maid vs young woman

maid and young woman both are nouns.

Word	Noun	Adjective	Verb	Adverb
maid	Yes	No	No	No
young woman	Yes	No	No	No

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

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

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