Is SIS a valid Scrabble word?
YES — SIS is a valid Scrabble word 3 points
Scrabble® and Words With Friends® points for SIS
SIS is a valid Scrabble US/CAN word worth 3 points:
S1I1S1
SIS is valid in Scrabble UK (World) —
S1I1S1
SIS is a valid Words With Friends word worth 3 points:
S1I1S1