fava bean vs Vicia faba

fava bean and Vicia faba both are nouns.

Word	Noun	Adjective	Verb	Adverb
fava bean	Yes	No	No	No
Vicia faba	Yes	No	No	No

fava bean (noun)	Vicia faba (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