Yes, WAXBERRY is a Scrabble word!

Letter values in Scrabble US: W 4, A 1, X 8, B 3, E 1, R 1, R 1, Y 4.

Is it a valid word?

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

deciduous shrub of western North America having spikes of pink flowers followed by round white berries
deciduous aromatic shrub of eastern North America with grey-green wax-coated berries

Also: common snowberry, symphoricarpos alba, swamp candleberry, myrica pensylvanica.