peel vs banana peel

peel and banana peel both are nouns.

Word	Noun	Adjective	Verb	Adverb
peel	Yes	No	Yes	No
banana peel	Yes	No	No	No

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

peel: the rind of a fruit or vegetable
banana peel: the skin of a banana (especially when it is stripped off and discarded)

Other hyponyms of peel include jacket, banana skin, lemon peel, lemon rind, orange peel, orange rind.

peel (noun)	banana peel (noun)
the rind of a fruit or vegetable	the skin of a banana (especially when it is stripped off and discarded)

peel (verb)	banana peel (verb)
get undressed
remove the skin from
come off in flakes or thin small pieces