Yes, COWPEAS is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, W 4, P 3, E 1, A 1, S 1.

Is it a valid word?

COWPEAS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

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

Also: black-eyed pea, cowpea plant, vigna unguiculata, vigna sinensis.