firelight vs visible radiation

firelight and visible radiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
firelight	Yes	No	No	No
visible radiation	Yes	No	No	No

As nouns, visible radiation is a hypernym of firelight; that is, visible radiation is a word with a broader meaning than firelight:

firelight: the light of a fire (especially in a fireplace)
visible radiation: (physics) electromagnetic radiation that can produce a visual sensation

Other hypernyms of firelight include light, visible light.

firelight (noun)	visible radiation (noun)
the light of a fire (especially in a fireplace)	(physics) electromagnetic radiation that can produce a visual sensation