gleam vs radiancy

gleam and radiancy both are nouns.

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

As nouns, radiancy is a hypernym of gleam; that is, radiancy is a word with a broader meaning than gleam:

Other hypernyms of gleam include effulgence, radiance, refulgence, refulgency, shine.

gleam (noun)	radiancy (noun)
an appearance of reflected light	the quality of being bright and sending out rays of light
a flash of light (especially reflected light)

gleam (verb)	radiancy (verb)
to shine with faint or brief light
shine brightly, like a star or a light
be shiny, as if wet