radiance vs effulgence

radiance and effulgence both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiance	Yes	No	No	No
effulgence	Yes	No	No	No

As nouns, radiance and effulgence are synonyms defined as:

radiance and effulgence: the quality of being bright and sending out rays of light

Other synonyms of radiance include radiancy, refulgence, refulgency, shine.

radiance (noun)	effulgence (noun)
the quality of being bright and sending out rays of light	the quality of being bright and sending out rays of light
the amount of electromagnetic radiation leaving or arriving at a point on a surface
an attractive combination of good health and happiness