brilliance vs grandness

brilliance and grandness both are nouns.

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

As nouns, brilliance and grandness are synonyms defined as:

brilliance and grandness: the quality of being magnificent or splendid or grand

Other synonyms of brilliance include grandeur, magnificence, splendor, splendour.

brilliance (noun)	grandness (noun)
a light within the field of vision that is brighter than the brightness to which the eyes are adapted	the quality of being magnificent or splendid or grand
the quality of being magnificent or splendid or grand	unusual largeness in size or extent or number
unusual mental ability	splendid or imposing in size or appearance
	a prominent status