brilliance vs grandeur

brilliance and grandeur both are nouns.

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

As nouns, brilliance and grandeur are synonyms defined as:

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

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

brilliance (noun)	grandeur (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	the quality of elevation of mind and exaltation of character or ideals or conduct
unusual mental ability