Is AB a valid Scrabble word?
YES — AB is a valid Scrabble word 4 points
Scrabble® and Words With Friends® points for AB
AB is a valid Scrabble US/CAN word worth 4 points:
A1B3
AB is valid in Scrabble UK (World) —
A1B3
AB is a valid Words With Friends word worth 5 points:
A1B4