The word unretrievable 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: 23
Highest Scoring Words With Friends™ Play In The Letters unretrievable
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Seven Letter Word Alert: (88 words)
abluent, alerter, arbiter, arenite, averter, beeline, believe, bereave, bleater, blunter, blurter, burlier, earlier, elative, elevate, enabler, enteral, enterer, eternal, inerter, latrine, learner, leerier, lineate, nebulae, nebular, nervier, neutral, rarebit, ratline, realter, rebater, reblent, rebuilt, reenter, reinter, relater, relearn, reliant, relieve, renerve, retinal, retiree, retrain, retrial, reunite, revalue, reveler, revenue, reverie, reviler, riveter, rivulet, runtier, tearier, teenier, tenable, terrain, terrane, trailer, trainee, trainer, trenail, triable, triaene, tribune, tunable, turbine, unalert, unalter, unravel, unreeve, unrivet, uralite, urinate, uterine, vaulter, veinlet, veinule, veneral, ventral, venture, verbena, veteran, vibrant, vibrate, vinelet, virtual