How many points is THUMB worth in Scrabble?

THUMB is worth 12 points in Scrabble.

Is THUMB a valid Scrabble word? Yes — 12 points

Yes, THUMB is a valid Scrabble word worth 12 points.

Yes, THUMB is a valid Words With Friends word worth 14 points.

THUMB is a valid Scrabble US/CAN word worth 12 points:

T₁H₄U₁M₃B₃

THUMB is valid in Scrabble UK (World) —

T₁H₄U₁M₃B₃

THUMB is a valid Words With Friends word worth 14 points:

T₁H₃U₂M₄B₄

You can make 15 words from thumb according to the Scrabble US and Canada dictionary.