The word tergiversate 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 tergiversate
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Seven Letter Word Alert: (79 words)
aeriest, aigrets, arrives, artiest, artsier, attirer, attires, averser, averter, eagerer, eeriest, evitate, gaiters, garrets, garters, gearset, gestate, graters, gravest, gravies, greaser, greater, greeter, griever, grieves, grister, gritter, iratest, iterate, ratters, rattier, rearise, reavers, regears, regives, regrate, regreet, regrets, reserve, restage, restart, restate, restive, retaste, retears, retiree, retires, retreat, retrees, retries, reveres, reverie, reverse, reverts, reviser, riveter, seriate, serrate, severer, sievert, stagier, starter, starver, stative, steerer, striate, striver, targets, tarries, tastier, tearers, tearier, teeters, testier, treater, triages, trivets, veritas, vestige