effulgence vs refulgency

effulgence and refulgency both are nouns.

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

As nouns, effulgence and refulgency are synonyms defined as:

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

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

effulgence (noun)	refulgency (noun)
the quality of being bright and sending out rays of light	the quality of being bright and sending out rays of light