comic vs joker

comic and joker both are nouns.

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

As nouns, joker is a hyponym of comic; that is, joker is a word with a more specific, narrower meaning than comic:

comic (noun)	joker (noun)
a professional performer who tells jokes and performs comical acts	a playing card that is usually printed with a picture of a jester
	an inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent
	a person who enjoys telling or playing jokes
	a person who does something thoughtless or annoying

comic (adjective)	joker (adjective)
of or relating to or characteristic of comedy
arousing or provoking laughter