effulgence vs radiancy

effulgence and radiancy both are nouns.

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

As nouns, effulgence and radiancy are synonyms defined as:

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

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

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