butter-bean plant vs Phaseolus lunatus

butter-bean plant and Phaseolus lunatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter-bean plant	Yes	No	No	No
Phaseolus lunatus	Yes	No	No	No

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

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

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

butter-bean plant (noun)	Phaseolus lunatus (noun)
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