The word declassifies 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 declassifies
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Seven Letter Word Alert: (32 words)
aediles, aedilic, aidless, classed, classes, dailies, daisies, deciles, declass, defaces, defiles, defleas, deifies, descale, diesels, discase, disease, edifice, edifies, felsics, fissile, iceless, laicise, lassies, liaised, liaises, sacless, sealife, seaside, selfies, sessile, silicas