Vigna sinensis vs cowpea

Vigna sinensis and cowpea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vigna sinensis	Yes	No	No	No
cowpea	Yes	No	No	No

As nouns, Vigna sinensis and cowpea are synonyms defined as:

Vigna sinensis and cowpea: sprawling Old World annual cultivated especially in southern United States for food and forage and green manure

Other synonyms of Vigna sinensis include black-eyed pea, cowpea plant, Vigna unguiculata.

Vigna sinensis (noun)	cowpea (noun)
sprawling Old World annual cultivated especially in southern United States for food and forage and green manure	eaten fresh as shell beans or dried
	sprawling Old World annual cultivated especially in southern United States for food and forage and green manure
	fruit or seed of the cowpea plant