The word diathermies 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: 17
Highest Scoring Words With Friends™ Play In The Letters diathermies
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Seven Letter Word Alert: (94 words)
adheres, admires, aeriest, airiest, airside, airtime, aridest, astride, atheise, atheism, dairies, dearest, dearies, dearths, deities, demates, demerit, diaries, diarist, diester, dieters, diether, dieties, dimeter, dirhams, dirties, disrate, dithers, ditsier, earthed, emirate, hamster, hardest, hastier, hatreds, headers, headier, headset, hearsed, hearted, heaters, heisted, hermits, irisate, itemise, meatier, mediate, merited, meshier, metrise, midairs, midrash, misdate, misedit, mishear, misread, mistier, mitered, readies, readmes, readmit, reasted, redates, reedits, reemits, reheats, rehides, remated, remates, reteams, retimed, retimes, seamier, sedater, seriate, seriema, shadier, sheared, shirted, sidearm, siriema, smarted, smartie, smeared, steamed, steamer, stimied, tasered, threads, tidiers, timider, tirades, trashed, tridems