roister vs riot

roister is not a noun while riot is a noun.

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

As verbs, roister and riot are synonyms defined as:

Other synonyms of roister include carouse.

roister (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

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