radiance vs lustre

radiance and lustre both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiance	Yes	No	No	No
lustre	Yes	No	No	No

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

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

radiance (noun)	lustre (noun)
the quality of being bright and sending out rays of light	a surface coating for ceramics or porcelain
the amount of electromagnetic radiation leaving or arriving at a point on a surface	a quality that outshines the usual
an attractive combination of good health and happiness	the visual property of something that shines with reflected light