radiancy vs glow

radiancy and glow both are nouns.

Word	Noun	Adjective	Verb	Adverb
radiancy	Yes	No	No	No
glow	Yes	No	Yes	No

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

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

radiancy (noun)	glow (noun)
the quality of being bright and sending out rays of light	light from nonthermal sources
	an appearance of reflected light
	a feeling of considerable warmth
	the phenomenon of light emission by a body as its temperature is raised
	the amount of electromagnetic radiation leaving or arriving at a point on a surface
	a steady even light without flames
	an alert and refreshed state

radiancy (verb)	glow (verb)
	experience a feeling of well-being or happiness, as from good health or an intense emotion
	be exuberant or high-spirited
	emit a steady even light without flames
	have a complexion with a strong bright color, such as red or pink
	shine intensely, as if with heat