legume vs garbanzo

legume and garbanzo both are nouns.

Word	Noun	Adjective	Verb	Adverb
legume	Yes	No	No	No
garbanzo	Yes	No	No	No

As nouns, garbanzo is a hyponym of legume; that is, garbanzo is a word with a more specific, narrower meaning than legume:

legume: the seedpod of a leguminous plant (such as peas or beans or lentils)
garbanzo: large white roundish Asiatic legume; usually dried

Other hyponyms of legume include pulse, bean, edible bean, lentil, pea, chickpea, black-eyed pea, cowpea.

As nouns, garbanzo is a hyponym of legume; that is, garbanzo is a word with a more specific, narrower meaning than legume:

legume: the fruit or seed of any of various bean or pea plants consisting of a case that splits along both sides when ripe and having the seeds attach to one side of the case
garbanzo: the seed of the chickpea plant

Other hyponyms of legume include chickpea, lentil, pea, field pea, black-eyed pea, cowpea.

legume (noun)	garbanzo (noun)
the seedpod of a leguminous plant (such as peas or beans or lentils)	large white roundish Asiatic legume; usually dried
an erect or climbing bean or pea plant of the family Leguminosae	the seed of the chickpea plant
the fruit or seed of any of various bean or pea plants consisting of a case that splits along both sides when ripe and having the seeds attach to one side of the case