defensive vs protective

defensive is a noun but protective is not a noun.

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

defensive (noun)	protective (noun)
an attitude of defensiveness

defensive (adjective)	protective (adjective)
intended or appropriate for defending against or deterring aggression or attack	intended or adapted to afford protection of some kind
attempting to justify or defend in speech or writing	showing care
	(usually followed by `of') solicitously caring or mindful