moon ray vs ray of light

moon ray and ray of light both are nouns.

Word	Noun	Adjective	Verb	Adverb
moon ray	Yes	No	No	No
ray of light	Yes	No	No	No

As nouns, ray of light is a hypernym of moon ray; that is, ray of light is a word with a broader meaning than moon ray:

Other hypernyms of moon ray include beam, beam of light, irradiation, light beam, ray, shaft, shaft of light.

moon ray (noun)	ray of light (noun)
a ray of moonlight	a column of light (as from a beacon)