potato bean vs Apios americana

potato bean and Apios americana both are nouns.

Word	Noun	Adjective	Verb	Adverb
potato bean	Yes	No	No	No
Apios americana	Yes	No	No	No

As nouns, potato bean and Apios americana are synonyms defined as:

potato bean and Apios americana: a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans

Other synonyms of potato bean include Apios tuberosa, groundnut, groundnut vine, Indian potato, wild bean.

potato bean (noun)	Apios americana (noun)
nutlike tuber; important food of Native Americans	a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
twining plant of Amazon basin having large edible roots