sizeableness vs greatness

sizeableness and greatness both are nouns.

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

As nouns, sizeableness and greatness are synonyms defined as:

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

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

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