Phaseolus lunatus vs lima bean

Phaseolus lunatus and lima bean both are nouns.

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

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

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

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

Phaseolus lunatus (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