greatness vs enormity

greatness and enormity both are nouns.

Word	Noun	Adjective	Verb	Adverb
greatness	Yes	No	No	No
enormity	Yes	No	No	No

As nouns, enormity is a hyponym of greatness; that is, enormity is a word with a more specific, narrower meaning than greatness:

greatness (noun)	enormity (noun)
the property possessed by something or someone of outstanding importance or eminence	an act of extreme wickedness
unusual largeness in size or extent or number	the quality of extreme wickedness
	the quality of being outrageous
	vastness of size or extent