chickpea vs leguminous plant

chickpea and leguminous plant both are nouns.

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

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

chickpea: Asiatic herb cultivated for its short pods with one or two edible seeds
leguminous plant: an erect or climbing bean or pea plant of the family Leguminosae

Other hypernyms of chickpea include legume.

chickpea (noun)	leguminous plant (noun)
large white roundish Asiatic legume; usually dried	an erect or climbing bean or pea plant of the family Leguminosae
Asiatic herb cultivated for its short pods with one or two edible seeds
the seed of the chickpea plant