The word deconcentrate 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: 22
Highest Scoring Words With Friends™ Play In The Letters deconcentrate
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Seven Letter Word Alert: (45 words)
acceder, accrete, acetone, cadence, canteen, cantred, catered, centred, coacted, codetta, coerced, concede, concern, concert, connect, contact, contend, content, cordate, cornett, created, dentate, detente, detract, enacted, enactor, encoder, encored, endnote, entente, entered, entrant, entreat, erected, neonate, nondate, notated, reacted, recaned, reenact, rotated, tacnode, ternate, tranced, treated