Yes, WILLOWWARE is a Scrabble word!

Letter values in Scrabble US: W 4, I 1, L 1, L 1, O 1, W 4, W 4, A 1, R 1, E 1.

Is it a valid word?

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

chinaware decorated with a blue Chinese design on a white background depicting a willow tree and often a river

Also: willow-pattern.