banana peel vs peel

banana peel and peel both are nouns.

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

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

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

Other hypernyms of banana peel include skin.

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

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