The word acoustically 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: 23
Highest Scoring Words With Friends™ Play In The Letters acoustically
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Seven Letter Word Alert: (27 words)
accloys, accusal, acicula, actuals, calculi, calicos, callous, callout, catcall, caustic, clastic, clausal, cloacal, cloacas, coastal, cyclist, layouts, lousily, lustily, occults, oculist, outcall, outlays, outsail, saltily, saucily, stoical