refulgency vs luster

refulgency and luster both are nouns.

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

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

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

refulgency (noun)	luster (noun)
the quality of being bright and sending out rays of light	a surface coating for ceramics or porcelain
	a quality that outshines the usual
	the visual property of something that shines with reflected light