antisubmarine vs defensive

antisubmarine is not a noun while defensive is a noun.

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

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

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