The word interrelate 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: 13
Highest Scoring Words With Friends™ Play In The Letters interrelate
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Seven Letter Word Alert: (46 words)
alerter, arenite, attirer, earlier, enteral, enterer, entitle, entreat, eternal, inerter, iterate, latrine, learner, leerier, lineate, nattier, nitrate, ratline, rattier, rattler, realter, reenter, reinter, relater, relearn, reliant, retinal, retiree, retitle, retrain, retreat, retrial, tearier, teenier, tentier, ternate, terrain, terrane, tertial, trailer, trainee, trainer, treater, treelet, trenail, triaene