pigeon pea vs Cajanus cajan

pigeon pea and Cajanus cajan both are nouns.

Word	Noun	Adjective	Verb	Adverb
pigeon pea	Yes	No	No	No
Cajanus cajan	Yes	No	No	No

As nouns, pigeon pea and Cajanus cajan are synonyms defined as:

pigeon pea and Cajanus cajan: tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics

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

pigeon pea (noun)	Cajanus cajan (noun)
small highly nutritious seed of the tropical pigeon-pea plant	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