lima bean vs Phaseolus lunatus

lima bean and Phaseolus lunatus both are nouns.

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

As nouns, lima bean and Phaseolus lunatus are synonyms defined as:

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

Other synonyms of lima bean include butter-bean plant, butter bean, sieva bean.

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