hostility vs violence

hostility and violence both are nouns.

Word	Noun	Adjective	Verb	Adverb
hostility	Yes	No	No	No
violence	Yes	No	No	No

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

Other hyponyms of hostility include meat grinder, force, pillage, pillaging, plundering.

hostility (noun)	violence (noun)
violent action that is hostile and usually unprovoked	an act of aggression (as one against a person who resists)
a hostile (very unfriendly) disposition	the property of being wild or turbulent
the feeling of a hostile person	a turbulent state resulting in injuries and destruction etc.
a state of deep-seated ill-will