BIG BASINS can be described as large containers that are used for a variety of purposes. The two crossword solutions for this term are TUBS and VATS, both of which have four letters. TUBS are typically round or oval-shaped and made of plastic, metal, or wood. They are often used for bathing, laundry, and storage. VATS are usually larger than TUBS and are usually made of metal or concrete. They are commonly used in industrial settings for the production of food, beverages, and chemicals.