violence vs road rage

violence and road rage both are nouns.

Word	Noun	Adjective	Verb	Adverb
violence	Yes	No	No	No
road rage	Yes	No	No	No

As nouns, road rage is a hyponym of violence; that is, road rage is a word with a more specific, narrower meaning than violence:

Other hyponyms of violence include domestic violence, public violence, riot.

violence (noun)	road rage (noun)
an act of aggression (as one against a person who resists)	violence exhibited by drivers in traffic
the property of being wild or turbulent
a turbulent state resulting in injuries and destruction etc.