preventive vs permissive

preventive is a noun but permissive is not a noun.

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

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