adsuki bean vs leguminous plant

adsuki bean and leguminous plant both are nouns.

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

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

adsuki bean: bushy annual widely grown in China and Japan for the flour made from its seeds
leguminous plant: an erect or climbing bean or pea plant of the family Leguminosae

Other hypernyms of adsuki bean include legume.

adsuki bean (noun)	leguminous plant (noun)
bushy annual widely grown in China and Japan for the flour made from its seeds	an erect or climbing bean or pea plant of the family Leguminosae