The word thereinafter 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: 18
Highest Scoring Words With Friends™ Play In The Letters thereinafter
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Seven Letter Word Alert: (45 words)
arenite, attirer, earthen, enterer, entreat, fainter, farther, fattier, feather, ferrite, fireant, fretter, fritter, hairnet, hearten, heftier, inerter, iterate, nattier, neither, nitrate, rattier, reefier, reenter, refiner, refrain, reinter, retiree, retrain, retreat, tearier, teenier, teether, tentier, ternate, terrain, terrane, theater, theatre, thereat, therein, trainee, trainer, treater, triaene