irradiate vs irradiation

irradiate is not a noun while irradiation is a noun.

Word	Noun	Adjective	Verb	Adverb
irradiate	No	No	Yes	No
irradiation	Yes	No	No	No

irradiate (noun)	irradiation (noun)
	(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

irradiate (verb)	irradiation (verb)
expose to radiation
cast rays of light upon
give spiritual insight to; in religion