riotous vs riot

riotous is not a noun while riot is a noun.

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

riotous (noun)	riot (noun)
	a public act of violence by an unruly mob
	a wild gathering involving excessive drinking and promiscuity
	a joke that seems extremely funny
	a state of disorder involving group violence

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

riotous (verb)	riot (verb)
	take part in a riot; disturb the public peace by engaging in a riot
	engage in boisterous, drunken merrymaking