vestment vs robe

vestment and robe both are nouns.

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

As nouns, robe is a hypernym of vestment; that is, robe is a word with a broader meaning than vestment:

vestment: gown (especially ceremonial garments) worn by the clergy
robe: outerwear consisting of a long flowing garment used for official or ceremonial occasions

Other hypernyms of vestment include gown.

vestment (noun)	robe (noun)
gown (especially ceremonial garments) worn by the clergy	any loose flowing garment
	outerwear consisting of a long flowing garment used for official or ceremonial occasions

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