legume vs leguminous

legume is a noun but leguminous is not a noun.

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

legume (noun)	leguminous (noun)
the seedpod of a leguminous plant (such as peas or beans or lentils)
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

legume (adjective)	leguminous (adjective)
	relating to or consisting of legumes