Yes, ZYMASES is a Scrabble word!

Letter values in Scrabble US: Z 10, Y 4, M 3, A 1, S 1, E 1, S 1.

Is it a valid word?

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

a complex of enzymes that cause glycolysis; originally found in yeast but also present in higher organisms