broad bean vs broad-bean plant

broad bean and broad-bean plant both are nouns.

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

As nouns, broad bean and broad-bean plant are synonyms defined as:

broad bean and broad-bean plant: Old World upright plant grown especially for its large flat edible seeds but also as fodder

Other synonyms of broad bean include broad-bean, English bean, European bean, field bean, Vicia faba.

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