Is PSI a valid Scrabble word?
YES — PSI is a valid Scrabble word 5 points
Scrabble® and Words With Friends® points for PSI
PSI is a valid Scrabble US/CAN word worth 5 points:
P3S1I1
PSI is valid in Scrabble UK (World) —
P3S1I1
PSI is a valid Words With Friends word worth 6 points:
P4S1I1