radiancy vs refulgence

radiancy and refulgence both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiancy	Yes	No	No	No
refulgence	Yes	No	No	No

As nouns, radiancy and refulgence are synonyms defined as:

radiancy and refulgence: the quality of being bright and sending out rays of light

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

radiancy (noun)	refulgence (noun)
the quality of being bright and sending out rays of light	the quality of being bright and sending out rays of light