lambency vs radiance

lambency and radiance both are nouns.

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

As nouns, radiance is a hypernym of lambency; that is, radiance is a word with a broader meaning than lambency:

Other hypernyms of lambency include effulgence, radiancy, refulgence, refulgency, shine.

lambency (noun)	radiance (noun)
an appearance of reflected light	the quality of being bright and sending out rays of light
	the amount of electromagnetic radiation leaving or arriving at a point on a surface
	an attractive combination of good health and happiness