grandness vs sizeableness

grandness and sizeableness both are nouns.

Word	Noun	Adjective	Verb	Adverb
grandness	Yes	No	No	No
sizeableness	Yes	No	No	No

As nouns, grandness and sizeableness are synonyms defined as:

grandness and sizeableness: unusual largeness in size or extent or number

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

grandness (noun)	sizeableness (noun)
the quality of being magnificent or splendid or grand	unusual largeness in size or extent or number
unusual largeness in size or extent or number
splendid or imposing in size or appearance
a prominent status