top banana vs comedian

top banana and comedian both are nouns.

Word	Noun	Adjective	Verb	Adverb
top banana	Yes	No	No	No
comedian	Yes	No	No	No

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

top banana: the leading comedian in a burlesque show
comedian: a professional performer who tells jokes and performs comical acts

Other hypernyms of top banana include comic.

top banana (noun)	comedian (noun)
the leading comedian in a burlesque show	a professional performer who tells jokes and performs comical acts
the most important person in a group or undertaking	an actor in a comedy