wild bean vs tuber

wild bean and tuber both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild bean	Yes	No	No	No
tuber	Yes	No	No	No

As nouns, tuber is a hypernym of wild bean; that is, tuber is a word with a broader meaning than wild bean:

wild bean: nutlike tuber; important food of Native Americans
tuber: a fleshy underground stem or root serving for reproductive and food storage

wild bean (noun)	tuber (noun)
nutlike tuber; important food of Native Americans	a fleshy underground stem or root serving for reproductive and food storage
a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans