Scrabble Dictionary

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Yes, damper is playable

...and is worth 13 points.

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OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Damper" Definition

noun

A device that eliminates or progressively diminishes vibrations or oscillations, as of a magnetic needle.
An adjustable plate, as in the flue of a furnace or stove, for controlling the draft.
Music A device in various keyboard instruments for deadening the vibrations of the strings.
Music A mute for various brass instruments.
One that deadens, restrains, or depresses: Rain put a damper on our picnic plans.