bank note vs bank bill

bank note and bank bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
bank note	Yes	No	No	No
bank bill	Yes	No	No	No

As nouns, bank note and bank bill are synonyms defined as:

bank note and bank bill: a piece of paper money (especially one issued by a central bank)

Other synonyms of bank note include banker's bill, banknote, bill, Federal Reserve note, government note, greenback, note.

bank note (noun)	bank bill (noun)
a piece of paper money (especially one issued by a central bank)	a piece of paper money (especially one issued by a central bank)