red gram vs pigeon-pea plant

red gram and pigeon-pea plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
red gram	Yes	No	No	No
pigeon-pea plant	Yes	No	No	No

As nouns, red gram and pigeon-pea plant are synonyms defined as:

red gram and pigeon-pea plant: tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics

Other synonyms of red gram include cajan pea, Cajanus cajan, catjang pea, dahl, dhal, pigeon pea.

red gram (noun)	pigeon-pea plant (noun)
tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics	tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics