The word pestilential 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 pestilential
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Seven Letter Word Alert: (58 words)
alpeens, alpines, aplites, elastin, elitist, ellipse, entails, entitle, epistle, illites, install, instate, instill, lateens, latents, latites, leanest, lenites, lentils, lineate, lintels, nailset, neatest, nettles, palette, pallets, panties, patents, patient, patines, patties, pelites, pellets, peltate, penlite, pentail, petites, pianist, pieties, pietist, pilates, pintail, planets, salient, septate, spaniel, spelean, spittle, stipite, tailpin, talents, tallest, tallies, tellies, telnets, tensile, tiepins, tiniest