second banana vs performer

second banana and performer both are nouns.

Word	Noun	Adjective	Verb	Adverb
second banana	Yes	No	No	No
performer	Yes	No	No	No

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

second banana: a performer who acts as stooge to a comedian
performer: an entertainer who performs a dramatic or musical work for an audience

Other hypernyms of second banana include performing artist.

second banana (noun)	performer (noun)
a performer who acts as stooge to a comedian	an entertainer who performs a dramatic or musical work for an audience
someone who serves in a subordinate capacity or plays a secondary role