Yes, WHERRY is a Scrabble word!

Letter values in Scrabble US: W 4, H 4, E 1, R 1, R 1, Y 4.

Is it a valid word?

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

sailing barge used especially in East Anglia
light rowboat for use in racing or for transporting goods and passengers in inland waters and harbors

Also: norfolk wherry.