legume vs edible bean

legume and edible bean both are nouns.

Word	Noun	Adjective	Verb	Adverb
legume	Yes	No	No	No
edible bean	Yes	No	No	No

As nouns, edible bean is a hyponym of legume; that is, edible bean 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)
edible bean: any of various edible seeds of plants of the family Leguminosae used for food

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

legume (noun)	edible bean (noun)
the seedpod of a leguminous plant (such as peas or beans or lentils)	any of various edible seeds of plants of the family Leguminosae used for food
an erect or climbing bean or pea plant of the family Leguminosae
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