beam of light vs sunray

beam of light and sunray both are nouns.

Word	Noun	Adjective	Verb	Adverb
beam of light	Yes	No	No	No
sunray	Yes	No	No	No

As nouns, sunray is a hyponym of beam of light; that is, sunray is a word with a more specific, narrower meaning than beam of light:

Other hyponyms of beam of light include heat ray, high beam, moon-ray, moon ray, moonbeam, sunbeam, laser beam, low beam.

beam of light (noun)	sunray (noun)
a column of light (as from a beacon)	a ray of sunlight
	a ray of artificial ultraviolet light from a sunray lamp
	herb having a basal cluster of grey-green leaves and leafless stalks each with a solitary broad yellow flower head; desert areas Idaho to Arizona