orgiastic vs bacchanal

orgiastic is not a noun while bacchanal is a noun.

Word	Noun	Adjective	Verb	Adverb
orgiastic	No	Yes	No	No
bacchanal	Yes	Yes	No	No

As adjectives, orgiastic and bacchanal are synonyms defined as:

Other synonyms of orgiastic include bacchanalian, bacchic, carousing.

orgiastic (noun)	bacchanal (noun)
	a wild gathering involving excessive drinking and promiscuity
	someone who engages in drinking bouts
	a drunken reveller; a devotee of Bacchus

orgiastic (adjective)	bacchanal (adjective)
used of riotously drunken merrymaking	used of riotously drunken merrymaking
used of frenzied sexual activity