negligee vs peignoir

negligee and peignoir both are nouns.

Word	Noun	Adjective	Verb	Adverb
negligee	Yes	No	No	No
peignoir	Yes	No	No	No

As nouns, negligee and peignoir are synonyms defined as:

Other synonyms of negligee include housecoat, neglige, wrapper.

negligee (noun)	peignoir (noun)
a loose dressing gown for women	a loose dressing gown for women