Durum and Wheat

Durum noun - Wheat with hard dark-colored kernels high in gluten and used for bread and pasta; grown especially in southern Russia, North Africa, and northern central North America.

Wheat and durum are semantically related In some cases you can use "Wheat" instead a noun "Durum".

Wheat noun - Annual or biennial grass having erect flower spikes and light brown grains.

Durum and wheat are semantically related in grain topic. You can use "Durum" instead a noun "Wheat".