Is COS a valid Scrabble word?
YES — COS is a valid Scrabble word 5 points
Scrabble® and Words With Friends® points for COS
COS is a valid Scrabble US/CAN word worth 5 points:
C3O1S1
COS is valid in Scrabble UK (World) —
C3O1S1
COS is a valid Words With Friends word worth 6 points:
C4O1S1