shaft of light vs irradiation

shaft of light and irradiation both are nouns.

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

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

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

shaft of light (noun)	irradiation (noun)
a column of light (as from a beacon)	(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance
	the apparent enlargement of a bright object when viewed against a dark background
	(Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus
	(physiology) the spread of sensory neural impulses in the cortex
	a column of light (as from a beacon)
	the condition of being exposed to radiation