bean plant vs leguminous plant

bean plant and leguminous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
bean plant	Yes	No	No	No
leguminous plant	Yes	No	No	No

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

bean plant: any of various leguminous plants grown for their edible seeds and pods
leguminous plant: an erect or climbing bean or pea plant of the family Leguminosae

Other hypernyms of bean plant include legume.

bean plant (noun)	leguminous plant (noun)
any of various leguminous plants grown for their edible seeds and pods	an erect or climbing bean or pea plant of the family Leguminosae