The word interdependency 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: 28
Highest Scoring Words With Friends™ Play In The Letters interdependency
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Seven Letter Word Alert: (49 words)
centred, creeped, cryptid, decider, decreed, decried, decrypt, deepend, dentine, detrend, dienyne, encrypt, entered, enteric, enticed, enticer, epicene, epicyte, erected, inepter, needier, nitrene, pendent, pentene, pentyne, percent, petered, pierced, precede, precent, predict, preedit, preened, preteen, pretend, printed, receded, receipt, recited, repined, retyped, ripened, teenier, tepider, terpene, terpine, tindery, trended, yperite