The term 'Big Bean' can be broken down into two crossword solutions: LIMA (4 letters) and Fava (4 letters). LIMA is a type of bean that is native to South America and is also known as the butter bean. It is a large, flat, oval-shaped bean that is often used in soups, stews, and salads. Fava beans are also known as broad beans and are a type of legume that is popular in Mediterranean cuisine. They are usually eaten fresh or dried and can be used in a variety of dishes. Both LIMA and Fava beans are considered to be 'big beans' due to their size and versatility.