sesbania vs leguminous plant

sesbania and leguminous plant both are nouns.

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

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

sesbania: any of various plants of the genus Sesbania having pinnate leaves and large showy pea-like flowers
leguminous plant: an erect or climbing bean or pea plant of the family Leguminosae

Other hypernyms of sesbania include legume.

sesbania (noun)	leguminous plant (noun)
any of various plants of the genus Sesbania having pinnate leaves and large showy pea-like flowers	an erect or climbing bean or pea plant of the family Leguminosae