prevent vs preventive

prevent is not a noun while preventive is a noun.

Word	Noun	Adjective	Verb	Adverb
prevent	No	No	Yes	No
preventive	Yes	Yes	No	No

prevent (noun)	preventive (noun)
	remedy that prevents or slows the course of an illness or disease
	an agent or device intended to prevent conception
	any obstruction that impedes or is burdensome

prevent (adjective)	preventive (adjective)
	tending to prevent or hinder
	preventing or contributing to the prevention of disease

prevent (verb)	preventive (verb)
stop (someone or something) from doing something or being in a certain state
keep from happening or arising; make impossible