bacchanalian vs bacchanal

bacchanalian is not a noun while bacchanal is a noun.

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

As adjectives, bacchanalian and bacchanal are synonyms defined as:

Other synonyms of bacchanalian include bacchic, carousing, orgiastic.

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

bacchanalian (adjective)	bacchanal (adjective)
used of riotously drunken merrymaking	used of riotously drunken merrymaking