How many points is QUACK worth in Scrabble?

QUACK is worth 20 points in Scrabble.

Is QUACK a valid Scrabble word? Yes — 20 points

Yes, QUACK is a valid Scrabble word worth 20 points.

Yes, QUACK is a valid Words With Friends word worth 22 points.

QUACK is a valid Scrabble US/CAN word worth 20 points:

Q₁₀U₁A₁C₃K₅

QUACK is valid in Scrabble UK (World) —

Q₁₀U₁A₁C₃K₅

QUACK is a valid Words With Friends word worth 22 points:

Q₁₀U₂A₁C₄K₅

You can make 5 words from quack according to the Scrabble US and Canada dictionary.