The word "fees" refers to a sum of money charged for a service or product. However, there are several synonyms that can be used to describe these charges. One synonym is "charges," which can be used in a broad sense to refer to any cost related to a product or service. Another synonym is "tariffs," which typically refers to a specific set of charges related to international trade. Other synonyms include "prices," "rates," "costs," and "tuition." Each of these words can be used in different contexts to describe the cost of various products and services.