grandeur vs brilliance

grandeur and brilliance both are nouns.

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

As nouns, grandeur and brilliance are synonyms defined as:

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

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

grandeur (noun)	brilliance (noun)
the quality of being magnificent or splendid or grand	a light within the field of vision that is brighter than the brightness to which the eyes are adapted
the quality of elevation of mind and exaltation of character or ideals or conduct	the quality of being magnificent or splendid or grand
	unusual mental ability