The word nonbelievers 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: 22
Highest Scoring Words With Friends™ Plays In The Letters nonbelievers
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Seven Letter Word Alert: (34 words)
beeline, believe, boilers, bonnier, boreens, bovines, ebonies, elevens, enliven, ennoble, enrobes, enviers, environ, erosive, inverse, nonevil, observe, obverse, onliner, overlie, oversee, reboils, relieve, relines, relives, resolve, reviles, servile, veilers, veneers, venison, verbose, versine, version