defensive vs defend

defensive is a noun but defend is not a noun.

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

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

defensive (adjective)	defend (adjective)
intended or appropriate for defending against or deterring aggression or attack
attempting to justify or defend in speech or writing

defensive (verb)	defend (verb)
	argue or speak in defense of
	state or assert
	be on the defensive; act against an attack
	protect against a challenge or attack
	protect or fight for as a champion
	fight against or resist strongly
	be the defense counsel for someone in a trial