The term 'Certain Pudding Base' can be broken down into two crossword solutions: RICE (4 letters) and TAPIOCA (7 letters). RICE is a grain that is widely used in many cultures as a staple food. It is often boiled, steamed, or fried and used in a variety of dishes. TAPIOCA is a starch extracted from the root of the cassava plant. It is often used to make puddings, cakes, and other desserts. Both RICE and TAPIOCA are commonly used as bases for certain types of pudding.