The word acousticians is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 20
Highest Scoring Words With Friends™ Play In The Letters acousticians
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Seven Letter Word Alert: (28 words)
accosts, account, actinic, actions, atonias, atonics, auction, caisson, casinos, cations, caustic, caution, concuss, consist, cousins, iconist, nautica, nicosia, sanctus, satanic, sciatic, sonatas, stuccos, suction, sustain, tocsins, toucans, unstoic