Sales receipt is a commonly used term in commercial transactions that refers to a document issued by a seller to a buyer, which serves as evidence of payment for a product or service. However, there are several synonyms for this term that can be used interchangeably depending on the context. Some of the most commonly used synonyms for sales receipt include: invoice, bill, sales slip, receipt, sales ticket, purchase record, and payment record. Regardless of the term used, the purpose of a sales receipt remains the same - to provide proof of purchase and payment for a product or service.