horse gram vs horse grain

horse gram and horse grain both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse gram	Yes	No	No	No
horse grain	Yes	No	No	No

As nouns, horse gram and horse grain are synonyms defined as:

horse gram and horse grain: twining herb of Old World tropics cultivated in India for food and fodder; sometimes placed in genus Dolichos

Other synonyms of horse gram include Dolichos biflorus, Macrotyloma uniflorum, poor man's pulse.

horse gram (noun)	horse grain (noun)
twining herb of Old World tropics cultivated in India for food and fodder; sometimes placed in genus Dolichos	twining herb of Old World tropics cultivated in India for food and fodder; sometimes placed in genus Dolichos