The word unpreventable 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: 27
Highest Scoring Words With Friends™ Play In The Letters unpreventable
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Seven Letter Word Alert: (52 words)
abluent, annulet, bereave, bleater, bleeper, blunter, elevate, enabler, enteral, epaulet, epurate, eternal, lantern, nebulae, nebular, neutral, pentane, pentene, planner, planter, pleurae, prelate, preteen, prevent, reblent, repanel, replane, replant, replate, repleat, replete, revalue, revenue, tenable, terpene, trunnel, tunable, unalert, unalter, unblent, unearnt, uneaten, unlearn, unnerve, unravel, unreeve, vaulter, veneral, ventral, venture, verbena, veteran