atrocity vs heinousness

atrocity and heinousness both are nouns.

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

As nouns, atrocity and heinousness are synonyms defined as:

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

Other synonyms of atrocity include atrociousness, barbarity, barbarousness.

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