The word guaranties 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: 14
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (61 words)
against, agatine, agatise, aigrets, airguns, antsier, argents, artisan, atresia, augites, aunties, aurates, eartags, erasing, gainers, gaiters, garnets, gastrin, gateaus, gaunter, granite, guarani, guineas, guitars, gunters, gustier, gutsier, iguanas, ingrate, nastier, natures, nutsier, ratings, regains, restain, resting, retains, retinas, reusing, rusting, sangria, saunter, saurian, searing, seating, sinuate, stagier, stainer, staring, stinger, strange, tanager, tangier, teargas, tearing, teasing, triages, tsarina, uniters, unstage, urinate