The word interdependence 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: 26
Highest Scoring Words With Friends™ Play In The Letters interdependence
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Seven Letter Word Alert: (40 words)
centred, creeped, decider, decreed, decried, deepend, dentine, detrend, entered, enteric, enticed, enticer, epicene, erected, inepter, needier, nitrene, pendent, pentene, percent, petered, pierced, precede, precent, predict, preedit, preened, preteen, pretend, printed, receded, receipt, recited, repined, ripened, teenier, tepider, terpene, terpine, trended