bean plant vs bush bean

bean plant and bush bean both are nouns.

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

As nouns, bush bean is a hyponym of bean plant; that is, bush bean is a word with a more specific, narrower meaning than bean plant:

bean plant: any of various leguminous plants grown for their edible seeds and pods
bush bean: a bean plant whose bushy growth needs no supports

Other hyponyms of bean plant include pole bean, shell bean, shell bean plant.

bean plant (noun)	bush bean (noun)
any of various leguminous plants grown for their edible seeds and pods	a bean plant whose bushy growth needs no supports