luster vs effulgence

luster and effulgence both are nouns.

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

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

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

luster (noun)	effulgence (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