light beam vs shaft of light

light beam and shaft of light both are nouns.

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

As nouns, light beam and shaft of light are synonyms defined as:

Other synonyms of light beam include beam, beam of light, irradiation, ray, ray of light, shaft.

light beam (noun)	shaft of light (noun)
a column of light (as from a beacon)	a column of light (as from a beacon)