A wine cask is a large container used to store and transport wine. It is typically made of wood, and can come in various shapes and sizes. The term 'tierce' (6 letters) refers to a cask that holds about 42 gallons of wine, while a 'TUN' (3 letters) is a cask that holds about 252 gallons. A 'VAT' (3 letters) is a larger cask that holds up to 454 gallons, and a 'BUTT' (4 letters) is the largest type of cask, holding up to 586 gallons.