luster vs refulgency

luster and refulgency both are nouns.

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

As nouns, refulgency is a hypernym of luster; that is, refulgency is a word with a broader meaning than luster:

Other hypernyms of luster include effulgence, radiance, radiancy, refulgence, shine.

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