goofball vs comedian

goofball and comedian both are nouns.

Word	Noun	Adjective	Verb	Adverb
goofball	Yes	No	No	No
comedian	Yes	No	No	No

As nouns, comedian is a hypernym of goofball; that is, comedian is a word with a broader meaning than goofball:

goofball: a person who amuses others by ridiculous behavior
comedian: a professional performer who tells jokes and performs comical acts

Other hypernyms of goofball include comic.

goofball (noun)	comedian (noun)
a man who is a stupid incompetent fool	a professional performer who tells jokes and performs comical acts
a person who amuses others by ridiculous behavior	an actor in a comedy