Yes, sound is playable
...and is worth 8 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Sound" Definition
noun
A distinctive noise: a hollow sound.
A long, relatively wide body of water, larger than a strait or a channel, connecting larger bodies of water.
A long, wide ocean inlet.
An instrument used to examine or explore body cavities, as for foreign bodies or other abnormalities, or to dilate strictures in them.
verb
To order, signal, or indicate by a sound .
To examine by causing to emit .
adjective
Based on valid reasoning: a sound observation. See Synonyms at valid.
Compatible with an accepted point of view; conservative.
Deep and unbroken; undisturbed: a sound sleep.
Financially secure or safe: a sound economy.
Free from defect, decay, or damage; in good condition.
verb-transitive
Linguistics To articulate; pronounce: sound a vowel.
To cause to give forth or produce a sound: sounded the gong.
To examine (a body organ or part) by causing to emit sound; auscultate.
To make known; celebrate: "Nations unborn your mighty names shall sound” ( Alexander Pope).
To measure the depth of (water), especially by means of a weighted line; fathom.
phrasal-verb
Sound off To count cadence when marching in military formation.
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