defensive vs antisubmarine

defensive is a noun but antisubmarine is not a noun.

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

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

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