Unpolished rice and Wild rice

Wild rice and unpolished rice are semantically related In some cases you can replace phrase "Wild rice" with "Unpolished rice", this phrases are similar.

Wild rice noun - Perennial aquatic grass of North America bearing grain used for food.

Unpolished rice and wild rice are semantically related in perennial aquatic grass topic. You can use "Unpolished rice" instead a noun phrase "Wild rice".