broad-bean plant vs fava bean

broad-bean plant and fava bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
broad-bean plant	Yes	No	No	No
fava bean	Yes	No	No	No

broad-bean plant (noun)	fava bean (noun)
Old World upright plant grown especially for its large flat edible seeds but also as fodder	shell beans cooked as lima beans
	seed of the broad-bean plant