butter-bean plant vs lima bean

butter-bean plant and lima bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter-bean plant	Yes	No	No	No
lima bean	Yes	No	No	No

As nouns, butter-bean plant and lima bean are synonyms defined as:

butter-bean plant and lima bean: bush bean plant cultivated especially in southern United States having small flat edible seeds

Other synonyms of butter-bean plant include butter bean, Phaseolus lunatus, sieva bean.

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