The term 'bulb used in cookery' can be summarized by two crossword solutions: LEEK (4 letters) and GARLIC (6 letters). Leeks are a type of vegetable that belong to the onion family and have a mild onion-like flavor. They are often used in soups, stews, and other dishes. GARLIC is a type of bulbous plant that is widely used in cooking for its pungent flavor. It is commonly used in many cuisines around the world and is often used to season meats, vegetables, and sauces.