barbarousness vs atrociousness

barbarousness and atrociousness both are nouns.

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

As nouns, barbarousness and atrociousness are synonyms defined as:

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

Other synonyms of barbarousness include atrocity, barbarity, heinousness.

barbarousness (noun)	atrociousness (noun)
the quality of being shockingly cruel and inhumane	the quality of being shockingly cruel and inhumane