field bean vs broad bean

field bean and broad bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
field bean	Yes	No	No	No
broad bean	Yes	No	No	No

As nouns, field bean and broad bean are synonyms defined as:

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

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

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