luster vs brightness

luster and brightness both are nouns.

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

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

luster: a quality that outshines the usual
brightness: the location of a visual perception along a continuum from black to white

luster (noun)	brightness (noun)
a surface coating for ceramics or porcelain	the location of a visual perception along a continuum from black to white
a quality that outshines the usual	the quality of being luminous; emitting or reflecting light
the visual property of something that shines with reflected light	intelligence as manifested in being quick and witty