The word clusterings 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: 19
Highest Scoring Words With Friends™ Plays In The Letters clusterings
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Seven Letter Word Alert: (81 words)
celsius, cistern, clients, clinger, cluster, cretins, cringes, cruises, curling, cursing, cussing, cutline, eluting, encrust, enlists, girnels, glisten, glister, gluiest, glutens, gristle, gruntle, gunless, gunters, gustier, gutless, gutsier, incests, incrust, ingests, ingress, insects, inserts, insults, insures, lingers, listens, lucites, luniest, lusters, lustier, lusting, nutsier, relists, resigns, resting, results, reusing, ringlet, rulings, rustics, rusting, rustles, rutiles, signers, signets, silents, singers, singles, singlet, sinters, slicers, slinger, sluicer, sluices, stencil, stinger, strings, suiters, sunrise, sutlers, tigress, tingler, tingles, tinsels, tugless, ugliest, uniters, unlists, unrests, utensil