lima bean vs lima bean

lima bean and lima bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
lima bean	Yes	No	No	No
lima bean	Yes	No	No	No

lima bean (noun)	lima bean (noun)
broad flat beans simmered gently; never eaten raw	broad flat beans simmered gently; never eaten raw
bush or tall-growing bean plant having large flat edible seeds	bush or tall-growing bean plant having large flat edible seeds
bush bean plant cultivated especially in southern United States having small flat edible seeds	bush bean plant cultivated especially in southern United States having small flat edible seeds