broad bean vs shell bean

broad bean and shell bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
broad bean	Yes	No	No	No
shell bean	Yes	No	No	No

As nouns, shell bean is a hypernym of broad bean; that is, shell bean is a word with a broader meaning than broad bean:

As nouns, shell bean is a hypernym of broad bean; that is, shell bean is a word with a broader meaning than broad bean:

broad bean: Old World upright plant grown especially for its large flat edible seeds but also as fodder
shell bean: a bean plant grown primarily for its edible seed rather than its pod

Other hypernyms of broad bean include shell bean plant.

broad bean (noun)	shell bean (noun)
shell beans cooked as lima beans	unripe beans removed from the pod before cooking
a bean plant cultivated for use animal fodder	a bean plant grown primarily for its edible seed rather than its pod
Old World upright plant grown especially for its large flat edible seeds but also as fodder
seed of the broad-bean plant