riotous vs profligate

riotous is not a noun while profligate is a noun.

Word	Noun	Adjective	Verb	Adverb
riotous	No	Yes	No	No
profligate	Yes	Yes	No	No

As adjectives, riotous and profligate are synonyms defined as:

Other synonyms of riotous include debauched, degenerate, degraded, dissipated, dissolute, fast, libertine.

riotous (noun)	profligate (noun)
	a dissolute man in fashionable society
	a recklessly extravagant consumer

riotous (adjective)	profligate (adjective)
produced or growing in extreme abundance	unrestrained by convention or morality
unrestrained by convention or morality	recklessly wasteful
characterized by unrest or disorder or insubordination