defensive vs justificative

defensive is a noun but justificative is not a noun.

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

As adjectives, defensive and justificative are synonyms defined as:

defensive and justificative: attempting to justify or defend in speech or writing

Other synonyms of defensive include justificatory.

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

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