cowpea plant vs Vigna unguiculata

cowpea plant and Vigna unguiculata both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowpea plant	Yes	No	No	No
Vigna unguiculata	Yes	No	No	No

As nouns, cowpea plant and Vigna unguiculata are synonyms defined as:

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

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

cowpea plant (noun)	Vigna unguiculata (noun)
sprawling Old World annual cultivated especially in southern United States for food and forage and green manure	sprawling Old World annual cultivated especially in southern United States for food and forage and green manure