fille de chambre vs chambermaid

fille de chambre and chambermaid both are nouns.

Word	Noun	Adjective	Verb	Adverb
fille de chambre	Yes	No	No	No
chambermaid	Yes	No	No	No

As nouns, fille de chambre and chambermaid are synonyms defined as:

fille de chambre and chambermaid: a maid who is employed to clean and care for bedrooms (now primarily in hotels)

fille de chambre (noun)	chambermaid (noun)
a maid who is employed to clean and care for bedrooms (now primarily in hotels)	a maid who is employed to clean and care for bedrooms (now primarily in hotels)