Extra Charge is a term used to describe an additional cost that is added to the original price of a product or service. The term can be broken down into three parts: Surtax (6 letters), FEE (3 letters), and Addon (5 letters). Surtax is an extra tax imposed on top of existing taxes, while a FEE is a payment made for a particular service or privilege. An addon is an additional feature or service that is added to a product or service. All three terms are related to the concept of an extra charge.