lounging robe vs robe-de-chambre

lounging robe and robe-de-chambre both are nouns.

Word	Noun	Adjective	Verb	Adverb
lounging robe	Yes	No	No	No
robe-de-chambre	Yes	No	No	No

As nouns, lounging robe and robe-de-chambre are synonyms defined as:

lounging robe and robe-de-chambre: a robe worn before dressing or while lounging

Other synonyms of lounging robe include dressing gown.

lounging robe (noun)	robe-de-chambre (noun)
a robe worn before dressing or while lounging	a robe worn before dressing or while lounging