atrociousness vs atrocity

atrociousness and atrocity both are nouns.

Word	Noun	Adjective	Verb	Adverb
atrociousness	Yes	No	No	No
atrocity	Yes	No	No	No

As nouns, atrociousness and atrocity are synonyms defined as:

atrociousness and atrocity: the quality of being shockingly cruel and inhumane

Other synonyms of atrociousness include barbarity, barbarousness, heinousness.

atrociousness (noun)	atrocity (noun)
the quality of being shockingly cruel and inhumane	an act of atrocious cruelty
	the quality of being shockingly cruel and inhumane