There's really no difference. Durum wheat is the plant. Semolina is a coarse grind of the durum wheat berries. You can also grind them finer to make durum flour.
They are different varieties of wheat. Canadian wheat needs a shorter growing season and the capability to grow in cooler temperatures. US wheat grows in the Midwest where it is hotter and has a...
Wheat berries are wheat kernels that have been stripped only of their inedible outer hulls. They're nutritious, but they take hours to cook.
Whole wheat (flour) is made from the entire grain of the...