Grains and Indian corn

Indian corn and grains are semantically related in maize topic. In some cases you can use "Indian corn" instead a noun "Grains".

Indian corn noun - Tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times.

Grains and Indian corn are semantically related in maize topic. You can use "Grains" instead a noun phrase "Indian corn".