Butterbean and Shell bean

Butterbean noun - Small flat green bean similar to lima beans.

Shell bean and butterbean are semantically related. In some cases you can use "Shell bean" instead a noun "Butterbean".

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

Butterbean and shell bean are semantically related. Sometimes you can replace term "Butterbean" with "Shell bean", this terms are similar.