comic vs humourous

comic is a noun but humourous is not a noun.

Word	Noun	Adjective	Verb	Adverb
comic	Yes	Yes	No	No
humourous	No	Yes	No	No

comic (noun)	humourous (noun)
a professional performer who tells jokes and performs comical acts

comic (adjective)	humourous (adjective)
of or relating to or characteristic of comedy	full of or characterized by humor
arousing or provoking laughter