effulgence vs gleam

effulgence and gleam both are nouns.

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

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

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

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

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