Vicia faba vs shell bean plant

Vicia faba and shell bean plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vicia faba	Yes	No	No	No
shell bean plant	Yes	No	No	No

As nouns, shell bean plant is a hypernym of Vicia faba; that is, shell bean plant is a word with a broader meaning than Vicia faba:

Vicia faba: Old World upright plant grown especially for its large flat edible seeds but also as fodder
shell bean plant: a bean plant grown primarily for its edible seed rather than its pod

Other hypernyms of Vicia faba include shell bean.

Vicia faba (noun)	shell bean plant (noun)
Old World upright plant grown especially for its large flat edible seeds but also as fodder	a bean plant grown primarily for its edible seed rather than its pod