Cereal grass and Zizania aquatica

Cereal grass noun - Grass whose starchy grains are used as food: wheat; rice; rye; oats; maize; buckwheat; millet.

Zizania aquatica and cereal grass are semantically related. In some cases you can replace phrase "Zizania aquatica" with "Cereal grass", this phrases are similar.

Zizania aquatica noun - Perennial aquatic grass of North America bearing grain used for food.

Cereal grass and Zizania aquatica are semantically related. You can use "Cereal grass" instead a noun phrase "Zizania aquatica".