preventive vs prevent

preventive is a noun but prevent is not a noun.

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

preventive (noun)	prevent (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

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

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