eclat vs brilliance

eclat and brilliance both are nouns.

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

As nouns, brilliance is a hypernym of eclat; that is, brilliance is a word with a broader meaning than eclat:

Other hypernyms of eclat include grandeur, grandness, magnificence, splendor, splendour.

eclat (noun)	brilliance (noun)
brilliant or conspicuous success or effect	a light within the field of vision that is brighter than the brightness to which the eyes are adapted
ceremonial elegance and splendor	the quality of being magnificent or splendid or grand
enthusiastic approval	unusual mental ability