The word predetermine 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: 20
Highest Scoring Words With Friends™ Play In The Letters predetermine
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Seven Letter Word Alert: (51 words)
demerit, demirep, dernier, dimeter, emender, emptied, emptier, entered, enterer, epiderm, inepter, inerter, merited, metered, mitered, miterer, needier, nerdier, petered, preedit, preemie, preened, preener, premeet, premier, preteen, pretend, preterm, printed, printer, reedier, reenter, reinter, remined, repined, repiner, reprime, reprint, retimed, retimer, retired, retiree, retreed, retried, ripened, teenier, tepider, terpene, terpine, tireder, trireme