Chestnut corn (lì sù) is two different plants and their fruits. Here is the difference between chestnut millet:

Plant species:

Chestnut: Chestnut is the fruit of the chestnut tree (Castanea). Chestnut tree belongs to the family of Castanea (Fagaceae) plants, common varieties are European chestnut, Japanese chestnut, American chestnut and so on.

Corn: Corn is a kind of grain, belonging to the grass family (Poaceae) plants. The main varieties of cereals are millet, yellow corn, purple corn and so on.

Botanical Characteristics:

Chestnut: The chestnut tree is a tall tree, usually with a broad crown and a hard trunk. Its fruit is a nut with a brown exterior and hard shell containing edible pulp and seeds inside.

Corn: The grain is a dwarf graminaceous plant with slender stalks and linear leaves. Its fruits are grains, usually yellow or white and granular, which can be used to process into grain flour or as feed.

Nutritional value:

Chestnuts: Chestnuts are rich in carbohydrates, protein, fiber, vitamin C and B vitamins, and minerals such as potassium, magnesium, iron and zinc. They are a low-fat, high-energy food and are often used in cooking and pastry making.

Corn: Grains are rich in protein, fiber, B vitamins and minerals such as iron, zinc and magnesium. They are a nutritious cereal crop and are used in flour, cookies, rice and alcoholic beverages.

Uses:

Chestnuts: Chestnuts are commonly used in cooking, either boiled or roasted and eaten, or made into desserts, breads and pastries. Chestnuts can also be made into traditional dishes such as chestnut rice, chestnut cake and chestnut soup.

Corn: Grain is generally used as a grain that can be ground into flour for pasta or steamed and used as a staple food. In some regions, grain is also used to brew rice wine or make other alcoholic beverages.