irrigation vs irrigate

irrigation is a noun but irrigate is not a noun.

Word	Noun	Adjective	Verb	Adverb
irrigation	Yes	No	No	No
irrigate	No	No	Yes	No

irrigation (noun)	irrigate (noun)
supplying dry land with water by means of ditches etc
(medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution

irrigation (verb)	irrigate (verb)
	supply with a constant flow or sprinkling of some liquid, for the purpose of cooling, cleansing, or disinfecting
	supply with water, as with channels or ditches or streams