immensity vs immenseness

immensity and immenseness both are nouns.

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

As nouns, immensity and immenseness are synonyms defined as:

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

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

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