Wheat and Wheat berry

Wheat noun - Grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour.

Wheat berry is a synonym for wheat. In some cases you can use "Wheat berry" instead a noun "Wheat".

Wheat berry noun - Grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour.

Wheat is a synonym for wheat berry. You can use "Wheat" instead a noun phrase "Wheat berry".