butter bean vs sieva bean

butter bean and sieva bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
butter bean	Yes	No	No	No
sieva bean	Yes	No	No	No

As nouns, butter bean and sieva bean are synonyms defined as:

Other synonyms of butter bean include butterbean, civet bean.

As nouns, butter bean and sieva bean are synonyms defined as:

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

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

butter bean (noun)	sieva bean (noun)
small flat green bean similar to lima beans	small flat green bean similar to lima beans
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