apparel vs robe

apparel and robe both are nouns.

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

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

apparel (noun)	robe (noun)
clothing in general	any loose flowing garment
	outerwear consisting of a long flowing garment used for official or ceremonial occasions

apparel (verb)	robe (verb)
provide with clothes or put clothes on	clothe formally; especially in ecclesiastical robes
	cover as if with clothing