radiance vs gleam

radiance and gleam both are nouns.

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

As nouns, gleam is a hyponym of radiance; that is, gleam is a word with a more specific, narrower meaning than radiance:

Other hyponyms of radiance include gleaming, glow, lambency, luster, lustre, sheen, shininess, burnish, gloss, glossiness, polish.

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

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