Freewheels are devices that allow a machine to continue spinning even if the input stops. They are commonly used in bicycles, motorcycles, and various types of machinery. Synonyms for freewheels include freewheeling, coasting, gliding, and rolling. These terms all describe movement without any external power or force. Other synonyms for freewheels that convey similar ideas of independence and self-sufficiency include self-propelling, self-sustaining, and self-contained. Freewheels also connote a sense of freedom and flexibility, and synonyms like unfettered, unrestricted, and unbridled capture this idea. Ultimately, the variety of synonyms for freewheels reflects the diversity of applications and contexts in which these devices are used.