ferocity vs furiousness

ferocity and furiousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
ferocity	Yes	No	No	No
furiousness	Yes	No	No	No

As nouns, ferocity and furiousness are synonyms defined as:

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

ferocity (noun)	furiousness (noun)
the property of being wild or turbulent	the property of being wild or turbulent