light beam vs visible radiation

light beam and visible radiation both are nouns.

Word	Noun	Adjective	Verb	Adverb
light beam	Yes	No	No	No
visible radiation	Yes	No	No	No

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

light beam: a column of light (as from a beacon)
visible radiation: (physics) electromagnetic radiation that can produce a visual sensation

Other hypernyms of light beam include light, visible light.

light beam (noun)	visible radiation (noun)
a column of light (as from a beacon)	(physics) electromagnetic radiation that can produce a visual sensation