revel vs orgy

revel and orgy both are nouns.

Word	Noun	Adjective	Verb	Adverb
revel	Yes	No	Yes	No
orgy	Yes	No	No	No

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

revel (noun)	orgy (noun)
unrestrained merrymaking	secret rite in the cults of ancient Greek or Roman deities involving singing and dancing and drinking and sexual activity
	any act of immoderate indulgence
	a wild gathering involving excessive drinking and promiscuity

revel (verb)	orgy (verb)
take delight in
celebrate noisily, often indulging in drinking; engage in uproarious festivities