violence vs fierceness

violence and fierceness both are nouns.

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

As nouns, violence and fierceness are synonyms defined as:

Other synonyms of violence include ferocity, furiousness, fury, vehemence, wildness.

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