Winders are devices that are used to wind up or tighten various objects. There are a number of synonyms for winders that can describe different types of these devices, such as spools, reels, rollers, and turners. Spools are commonly used for winding cords or thread, while reels are often used for winding fishing lines or electrical cords. Rollers are used to wind up sheets of paper or metal, and turners are used to wind up window blinds or other mechanical devices. Regardless of the specific application or type of device, winders are important tools for efficiently and effectively winding up a variety of objects for storage or use.