Adjective:
1. Relating to or resembling comedy; humorous or amusing: a comic story; a comic actor.
2. Causing or intended to cause laughter: a comic situation.
3. Grotesque or absurd in appearance: a comic figure.
Noun:
1. A person who performs in comedy: a stand-up comic; a comic actor.
2. A humorous story, often illustrated, in a newspaper or magazine: read the comics every day; a comic strip.
3. A humorous film or television show: a comic movie; a comic series.
4. (pl.) A type of book that contains humorous stories or jokes, often illustrated: read comics when bored; a comic book.
As an adjective, comic is used to describe something that is humorous or amusing, while as a noun, it refers to a person or thing that creates humor or laughter.