high beam vs shaft of light

high beam and shaft of light both are nouns.

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

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

high beam: the beam of a car's headlights that provides distant illumination
shaft of light: a column of light (as from a beacon)

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

high beam (noun)	shaft of light (noun)
the beam of a car's headlights that provides distant illumination	a column of light (as from a beacon)