A hat is a piece of headwear that provides protection from the sun, rain, and cold weather. It can also be a fashion accessory that adds style to an outfit. Synonyms for the word "hat" include cap, bonnet, beanie, beret, fedora, helmet, hood, sombrero, and turban. A cap is a type of casual hat that is usually made of cloth and has a brim or bill. A bonnet is a type of hat that covers the head and ties under the chin. A beanie is a close-fitting cap made of wool or other warm material. A fedora is a stylish hat with a soft brim and indented crown. A helmet is a protective headgear worn by soldiers, athletes, and motorcyclists. A hood is a garment that covers the head and neck. A sombrero is a wide-brimmed hat commonly worn in Mexico.