Yes, SCREEDS is a Scrabble word!

Letter values in Scrabble US: S 1, C 3, R 1, E 1, E 1, D 2, S 1.

Is it a valid word?

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

a long monotonous harangue
a long piece of writing
an accurately levelled strip of material placed on a wall or floor as guide for the even application of plaster or concrete