preservative vs protective

preservative is a noun but protective is not a noun.

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

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

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