Butter-bean plant and Shell bean plant

Butter-bean plant noun - Bush bean plant cultivated especially in southern United States having small flat edible seeds.

Shell bean plant and butter-bean plant are semantically related. In some cases you can use "Shell bean plant" instead a noun phrase "Butter-bean plant".

Shell bean plant noun - A bean plant grown primarily for its edible seed rather than its pod.

Butter-bean plant and shell bean plant are semantically related. Sometimes you can replace phrase "Butter-bean plant" with "Shell bean plant", this phrases are similar.