The word nonreversible 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 nonreversible
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Seven Letter Word Alert: (58 words)
beeline, believe, berries, boilers, bonnier, boreens, bovines, broiler, ebonies, elevens, enliven, ennoble, enrober, enrobes, enviers, environ, erosive, inverse, ironers, leerier, lorries, nervier, nonevil, observe, obverse, onliner, overlie, oversee, reboils, rebores, reelers, reliers, relieve, relines, relives, renerve, rerinse, reserve, resolve, reveler, reverbs, reveres, reverie, reverse, reviler, reviles, reviser, serener, servile, severer, sneerer, soberer, veilers, veneers, venison, verbose, versine, version