immensity vs enormousness

immensity and enormousness both are nouns.

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

As nouns, immensity and enormousness are synonyms defined as:

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

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

immensity (noun)	enormousness (noun)
unusual largeness in size or extent or number	unusual largeness in size or extent or number