Bill exchange refers to a financial transaction where banks or financial institutions exchange bills or promissory notes in exchange for cash or other bills. There are several synonyms for the term "bill exchange," including "discounting," "forfaiting," "acceptance credit," and "commercial paper." Discounting refers to the process where a bank purchases a bill from its owner at a discount. Forfaiting is a type of financing where exporters sell their receivables to financial institutions at a discount. Acceptance credit is an arrangement where a bank guarantees payment of a bill. Finally, commercial paper refers to an unsecured promissory note issued by a corporation or financial institution. All of these terms refer to different aspects of the bill exchange process in the banking and financial industry.