The word ultrasonic 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: 16
Highest Scoring Words With Friends™ Plays In The Letters ultrasonic
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Seven Letter Word Alert: (41 words)
actions, atonics, auction, cantors, cartons, cations, caution, citrons, clarion, consult, cratons, crustal, cuatros, curials, curtail, curtain, incrust, insular, lunatic, nitrous, nostril, oculars, oculist, oilcans, oscular, outsail, rainout, rations, rituals, rosalic, scrotal, stoical, suction, tailors, toucans, truncal, uncarts, unclots, uncoils, unstoic, urinals