Hazelnut is a type of nut that is commonly used in baking and cooking. It is also known by two other names, FILBERT (7 letters) and Cobnut (6 letters). FILBERT is the American name for the hazelnut, while cobnut is the British name. Hazelnuts are small, round nuts with a hard, brown shell and a sweet, creamy flavor. They are often used in desserts, such as cakes, cookies, and ice cream, as well as savory dishes, such as salads and sauces.