The word proselytes 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: 16
Highest Scoring Words With Friends™ Play In The Letters proselytes
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Seven Letter Word Alert: (41 words)
elopers, eyespot, leprosy, ospreys, osselet, ostlers, oysters, pelters, pesters, pestles, petless, petrels, petrols, poetess, posters, presets, replots, reposes, reposts, resoles, respelt, respots, resteps, restyle, retypes, roselet, slopers, spryest, steeply, stereos, sterols, storeys, stylers, stylops, systole, tersely, toeless, topless, toyless, tyloses, yelpers