immenseness vs immensity

immenseness and immensity both are nouns.

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

As nouns, immenseness and immensity are synonyms defined as:

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

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

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