The term 'Bouillabaisse Base' is a classic French seafood stew. The two crossword solutions for this term are 'FISH' (4 letters) and 'BROTH' (5 letters). The base of the stew is made up of a FISH BROTH, which is created by simmering FISH bones and vegetables in water. The FISH used in the stew can vary, but typically includes a variety of white FISH, shellfish, and sometimes even eel. The BROTH is then combined with saffron, garlic, tomatoes, and herbs to create the flavorful stew.