The word timeservers 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: 18
Highest Scoring Words With Friends™ Play In The Letters timeservers
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Seven Letter Word Alert: (42 words)
eeriest, emerses, esteems, meeters, messier, metrise, misters, miterer, reemits, remeets, reserve, restems, resters, restirs, restive, retimer, retimes, retiree, retires, retrees, retries, retrims, reveres, reverie, reverse, reverts, reviser, revises, riveter, servers, severer, sievert, smiters, steerer, stivers, striver, strives, teemers, trimers, trireme, verisms, verists