precautionary vs preventative

precautionary is not a noun while preventative is a noun.

Word	Noun	Adjective	Verb	Adverb
precautionary	No	Yes	No	No
preventative	Yes	Yes	No	No

precautionary (noun)	preventative (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

precautionary (adjective)	preventative (adjective)
taken in advance to protect against possible danger or failure	tending to prevent or hinder
	preventing or contributing to the prevention of disease