maid vs house servant

maid and house servant both are nouns.

Word	Noun	Adjective	Verb	Adverb
maid	Yes	No	No	No
house servant	Yes	No	No	No

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

maid: a female domestic
house servant: a servant who is paid to perform menial tasks around the household

Other hypernyms of maid include domestic, domestic help.

maid (noun)	house servant (noun)
an unmarried girl (especially a virgin)	a servant who is paid to perform menial tasks around the household
a female domestic