magnificence vs brilliance

magnificence and brilliance both are nouns.

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

As nouns, magnificence and brilliance are synonyms defined as:

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

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

magnificence (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
splendid or imposing in size or appearance	the quality of being magnificent or splendid or grand
	unusual mental ability