butter bean vs butter bean

butter bean and butter bean both are nouns.

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

butter bean (noun)	butter 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