Yes, PAPYRUSES is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, P 3, Y 4, R 1, U 1, S 1, E 1, S 1.

Is it a valid word?

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

paper made from the papyrus plant by cutting it in strips and pressing it flat; used by ancient Egyptians and Greeks and Romans
tall sedge of the Nile valley yielding fiber that served many purposes in historic times
a document written on papyrus

Also: egyptian paper reed, egyptian paper rush, paper rush, paper plant, cyperus papyrus.