Buck wheat and Buckwheat

Buckwheat and buck wheat are semantically related. In some cases you can use "Buckwheat" instead the phrase "Buck wheat" as a noun or an adjective.

Buckwheat noun - A member of the genus Fagopyrum; annual Asian plant with clusters of small pinkish white flowers and small edible triangular seeds which are used whole or ground into flour.

Buck wheat and buckwheat are semantically related. Sometimes you can replace phrase "Buck wheat" with "Buckwheat", this terms are similar.