bean vs legume

bean and legume both are nouns.

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

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

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

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

bean: any of various leguminous plants grown for their edible seeds and pods
legume: an erect or climbing bean or pea plant of the family Leguminosae

Other hypernyms of bean include leguminous plant.

bean (noun)	legume (noun)
informal terms for a human head	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
any of various leguminous plants grown for their edible seeds and pods	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
any of various seeds or fruits that are beans or resemble beans

bean (verb)	legume (verb)
hit on the head, especially with a pitched baseball