robe vs bathrobe

robe and bathrobe both are nouns.

Word	Noun	Adjective	Verb	Adverb
robe	Yes	No	Yes	No
bathrobe	Yes	No	No	No

As nouns, bathrobe is a hyponym of robe; that is, bathrobe is a word with a more specific, narrower meaning than robe:

Other hyponyms of robe include abaya, dressing gown, lounging robe, robe-de-chambre, kimono.

robe (noun)	bathrobe (noun)
any loose flowing garment	a loose-fitting robe of towelling; worn after a bath or swim
outerwear consisting of a long flowing garment used for official or ceremonial occasions

robe (verb)	bathrobe (verb)
clothe formally; especially in ecclesiastical robes
cover as if with clothing