comic vs amusing

comic is a noun but amusing is not a noun.

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

As adjectives, comic and amusing are synonyms defined as:

Other synonyms of comic include comical, funny, laughable, mirthful, risible.

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

comic (adjective)	amusing (adjective)
of or relating to or characteristic of comedy	arousing or provoking laughter
arousing or provoking laughter	providing enjoyment; pleasantly entertaining