C.O.D. stands for 'cash on delivery', meaning that payment is expected at the time of delivery. This term is commonly used in e-commerce and shipping industries. However, there are several synonyms for the term C.O.D. that can be used interchangeably. For instance, 'collect on delivery', 'payable on delivery', and 'cash on shipment' are all synonyms for C.O.D. These terms refer to the same concept of payment being made at the time of delivery. Many businesses use these synonyms to offer flexible payment options to their customers and ensure a smooth transaction process. Regardless of the term used, the concept remains the same: payment is expected upon delivery.