fertilization vs fertilize

fertilization is a noun but fertilize is not a noun.

Word	Noun	Adjective	Verb	Adverb
fertilization	Yes	No	No	No
fertilize	No	No	Yes	No

fertilization (noun)	fertilize (noun)
creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant
making fertile as by applying fertilizer or manure

fertilization (verb)	fertilize (verb)
	introduce semen into (a female)
	provide with fertilizers or add nutrients to
	make fertile or productive