banker's bill vs bank bill

banker's bill and bank bill both are nouns.

Word	Noun	Adjective	Verb	Adverb
banker's bill	Yes	No	No	No
bank bill	Yes	No	No	No

As nouns, banker's bill and bank bill are synonyms defined as:

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

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

banker's bill (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)