permissive vs preventive

permissive is not a noun while preventive is a noun.

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

permissive (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

permissive (adjective)	preventive (adjective)
granting or inclined or able to grant permission; not strict in discipline	tending to prevent or hinder
not preventive	preventing or contributing to the prevention of disease