The term 'BIG BREWERS' can be solved by the word 'URNS', which is a four-letter word. An urn is a large container, usually made of metal or ceramic, used for holding and pouring liquids such as water or beer. It is often used in brewing beer, as it is a convenient way to store and transport large amounts of liquid. In some cultures, URNS are also used for ceremonial purposes, such as storing the ashes of the deceased.