The word peridotites 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: 15
Highest Scoring Words With Friends™ Play In The Letters peridotites
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Seven Letter Word Alert: (79 words)
deities, deports, deposer, deposit, despite, detorts, diester, dieters, dieties, dietist, diopter, dioptre, diorite, dirties, distort, ditsier, ditties, dittoes, dopiest, dotiest, dotters, dottier, editors, epidote, episode, erotise, iodiser, iodites, peridot, periods, petites, pettier, pieties, pietist, pitiers, poetise, posited, potters, potties, preedit, preside, pretest, protest, protist, reedits, reposed, respite, riptide, roisted, ropiest, rosette, sortied, spiroid, spirted, spitted, sported, spotted, spotter, steroid, stipite, storied, striped, tepider, testier, tiderip, tidiers, tidiest, tierods, tipsier, tipster, tiptoed, tiptoer, tiptoes, topside, torpids, treetop, tripeds, tripods, tropist