race riot vs public violence

race riot and public violence both are nouns.

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

As nouns, public violence is a hypernym of race riot; that is, public violence is a word with a broader meaning than race riot:

race riot: a riot caused by hatred for one another of members of different races in the same community
public violence: a public act of violence by an unruly mob

Other hypernyms of race riot include riot.

race riot (noun)	public violence (noun)
a riot caused by hatred for one another of members of different races in the same community	a public act of violence by an unruly mob