irradiation vs irradiate

irradiation is a noun but irradiate is not a noun.

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

irradiation (noun)	irradiate (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

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