The word threadfishes 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: 20
Highest Scoring Words With Friends™ Plays In The Letters threadfishes
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Seven Letter Word Alert: (97 words)
adheres, aeriest, aridest, ashiest, astride, atheise, dashers, deafest, dearest, dearies, dearths, deashes, defeats, defiers, deserts, desires, dessert, diester, dieters, diether, disease, disrate, dithers, draftee, earthed, easiest, faeries, fairest, fathers, feasted, feather, festers, fiestas, fishers, freesia, hafters, hardest, hastier, hatreds, headers, headier, headset, hearsed, hearses, hearted, hearths, heaters, heather, hefters, heftier, heifers, heiress, heisted, herdess, hessite, rashest, ratfish, readies, reasted, redates, redfish, reedits, reheats, rehides, reseats, reshift, resides, resifts, satires, seaside, seaters, sedater, sedates, seriate, shaders, shadier, shafted, sheafed, sheared, sheathe, sheaths, sherifs, shifted, shifter, shirted, shrifts, sifters, stashed, strides, strifes, tasered, teasers, threads, tirades, trashed, trashes, tressed