A grain seed is a type of seed that is used to produce food crops. The four crossword solutions for the term 'A Grain Seed' are KERNEL (6 letters), OAT (3 letters), MILLET (6 letters) and RYE (3 letters). KERNEL is a type of grain seed that is commonly used to make flour, while OAT is a cereal grain that is often used to make oatmeal. MILLET is a type of grain seed that is used in many parts of the world as a staple food, and RYE is a cereal grain that is used to make bread and other baked goods.