horse grain vs poor man's pulse

horse grain and poor man's pulse both are nouns.

Word	Noun	Adjective	Verb	Adverb
horse grain	Yes	No	No	No
poor man's pulse	Yes	No	No	No

As nouns, horse grain and poor man's pulse are synonyms defined as:

horse grain and poor man's pulse: twining herb of Old World tropics cultivated in India for food and fodder; sometimes placed in genus Dolichos

Other synonyms of horse grain include Dolichos biflorus, horse gram, Macrotyloma uniflorum.

horse grain (noun)	poor man's pulse (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