atrocity vs atrociousness

atrocity and atrociousness both are nouns.

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

As nouns, atrocity and atrociousness are synonyms defined as:

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

Other synonyms of atrocity include barbarity, barbarousness, heinousness.

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