civet bean vs shell bean

civet bean and shell bean both are nouns.

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

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

civet bean (noun)	shell bean (noun)
small flat green bean similar to lima beans	unripe beans removed from the pod before cooking
	a bean plant grown primarily for its edible seed rather than its pod