is a specific kind of: bean, bean plant.

is a broader term that covers: lima bean, lima bean plant, Phaseolus limensis | butter-bean plant, butter bean, lima bean, Phaseolus lunatus, sieva bean | Phaseolus acutifolius latifolius, tepary bean | broad-bean, broad-bean plant, broad bean, English bean, European bean, field bean, Vicia faba.

has as a part: shell bean.