unpleasant vs offensive

unpleasant is not a noun while offensive is a noun.

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

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

unpleasant (adjective)	offensive (adjective)
offensive or disagreeable; causing discomfort or unhappiness	unpleasant or disgusting especially to the senses
	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