greatness vs enormousness

greatness and enormousness both are nouns.

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

As nouns, greatness and enormousness are synonyms defined as:

greatness and enormousness: unusual largeness in size or extent or number

Other synonyms of greatness include grandness, immenseness, immensity, sizeableness, vastness, wideness.

greatness (noun)	enormousness (noun)
the property possessed by something or someone of outstanding importance or eminence	unusual largeness in size or extent or number
unusual largeness in size or extent or number