incandescence vs brightness

incandescence and brightness both are nouns.

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

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

Other hypernyms of incandescence include brightness level, light, luminance, luminosity, luminousness.

incandescence (noun)	brightness (noun)
light from heat	the location of a visual perception along a continuum from black to white
the phenomenon of light emission by a body as its temperature is raised	the quality of being luminous; emitting or reflecting light
	intelligence as manifested in being quick and witty