mirthful vs comic

mirthful is not a noun while comic is a noun.

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

As adjectives, mirthful and comic are synonyms defined as:

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

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

mirthful (adjective)	comic (adjective)
arousing or provoking laughter	of or relating to or characteristic of comedy
full of or showing high-spirited merriment	arousing or provoking laughter