The word dedifferentiate 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: 24
Highest Scoring Words With Friends™ Play In The Letters dedifferentiate
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Seven Letter Word Alert: (61 words)
affined, arenite, attired, daffier, dandier, deaired, defiant, defined, definer, deified, deifier, denarii, dentate, detente, detrain, detrend, dietine, dirtied, drafted, draftee, drained, drifted, edified, edifier, entered, entreat, fainted, fainter, fattier, fifteen, fireant, fretted, indited, inditer, indraft, inertia, iterate, nattier, needier, niftier, nitrate, nitride, nitrite, nittier, readied, redated, refined, reified, tainted, teenier, tentier, ternate, tintier, tradein, trained, trainee, treaded, treated, trended, triaene, trident