inoffensive vs offensive

inoffensive is not a noun while offensive is a noun.

Word	Noun	Adjective	Verb	Adverb
inoffensive	No	Yes	No	No
offensive	Yes	Yes	No	No

inoffensive (noun)	offensive (noun)
	the action of attacking an enemy

inoffensive (adjective)	offensive (adjective)
giving no offense	unpleasant or disgusting especially to the senses
not causing anger or annoyance	causing anger or annoyance
	for the purpose of attack rather than defense
	morally offensive
	violating or tending to violate or offend against
	causing or able to cause nausea