The word diphthongises 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: 24
Highest Scoring Words With Friends™ Play In The Letters diphthongises
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Seven Letter Word Alert: (90 words)
deposit, designs, despots, dieting, digests, dingies, dishing, dispose, dissent, dissing, dogship, dogsits, dopiest, editing, edition, egoists, eighths, ghosted, gipsies, godsent, gothish, heights, hidings, highest, hightop, hipness, hissing, histone, hogtied, hogties, hoisted, hosting, hotness, ignited, ignites, indepth, indigos, indites, ingests, inosite, insides, insight, insteps, iodines, iodises, iodites, ionised, ionises, iphones, isospin, nightie, nosiest, phished, phonies, pigeons, pingoes, pisoids, pistons, pithing, pointed, poising, posited, posting, shindig, shoeing, sidings, sighted, signets, sinoids, siphons, snidest, spigots, spinets, spinode, spinose, spionid, spiting, sponged, sponges, stepson, stipend, stogies, stonish, thighed, thiones, thonged, tidings, tiepins, topside, tossing