fava bean vs broad-bean

fava bean and broad-bean both are nouns.

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

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