The word preconcerted 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 preconcerted
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Seven Letter Word Alert: (34 words)
centred, coerced, coercer, concede, concept, concert, correct, creeped, creeper, decreer, encoder, encored, entered, enterer, erected, erecter, erector, pentode, percent, petered, portend, precede, precent, precode, preened, preener, prenote, preteen, pretend, proceed, reenter, reerect, retreed, terpene