housecoat vs peignoir

housecoat and peignoir both are nouns.

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

As nouns, housecoat and peignoir are synonyms defined as:

Other synonyms of housecoat include neglige, negligee, wrapper.

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