public violence vs riot

public violence and riot both are nouns.

Word	Noun	Adjective	Verb	Adverb
public violence	Yes	No	No	No
riot	Yes	No	Yes	No

As nouns, public violence and riot are synonyms defined as:

public violence (noun)	riot (noun)
a public act of violence by an unruly mob	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

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