protective vs preservative

protective is not a noun while preservative is a noun.

Word	Noun	Adjective	Verb	Adverb
protective	No	Yes	No	No
preservative	Yes	Yes	No	No

protective (noun)	preservative (noun)
	a chemical compound that is added to protect against decay or decomposition

protective (adjective)	preservative (adjective)
intended or adapted to afford protection of some kind	tending or having the power to preserve
showing care
(usually followed by `of') solicitously caring or mindful