The word decentralises 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
Seven Letter Word Alert: (379 words)
actress, aediles, aeriest, aidless, airless, alerted, altered, ancress, aniseed, antlers, antsier, arcsine, arenite, aridest, arsenic, article, artless, ascends, ascents, ascites, astride, cairned, candies, candler, candles, canters, cantles, cantred, careens, carless, carnies, cartels, caseins, casters, castile, castled, castles, catered, censers, centers, central, centred, centres, cerates, cereals, cerises, certain, cinders, cistern, citadel, cladist, clarets, classed, cleaned, cleaner, cleanse, cleared, clients, cradles, creased, creases, created, creates, credits, cresset, crested, cretins, cristae, dacites, dancers, dealers, dearest, dearies, decalin, decanes, decants, decares, decease, deceits, decenes, deciles, declare, declass, decline, decrees, decrial, decries, deerlet, deicers, delates, deleter, deletes, delicts, delints, delists, deltaic, denials, deniers, densest, dentals, dentils, derails, desalts, descale, descant, descent, deserts, desilts, desires, dessert, destain, destine, details, detains, detrain, dialect, dialers, diesels, diester, dieters, dilater, dilates, directs, discant, discase, discern, disease, disrate, dissect, dissent, drastic, earless, earnest, easiest, eastern, eclairs, eeriest, elastic, elastin, elaters, eldress, elected, enacted, encased, encases, endears, endless, enlards, enlists, enseals, ensears, entails, enteral, entered, enteric, enticed, enticer, entices, entrees, entries, erected, essence, eternal, iceless, incased, incests, insects, inserts, instars, instead, islands, laciest, lancers, lancets, landers, lateens, latrine, leaders, leaners, leanest, learned, leasers, lectern, lenders, lenited, lenites, license, lineate, linseed, listens, nailers, nailset, nastier, nearest, nectars, needers, needier, needler, needles, nesters, nestled, nestles, netless, raciest, racists, radicel, radices, radicle, ratline, reacted, readies, realest, realise, realist, reasted, recaned, recanes, recants, recasts, recedes, recital, recited, recites, reclads, reclass, reclean, recline, redacts, redates, redeals, redealt, redials, redline, redness, reedits, reelect, reenact, reested, relaced, relaces, related, relates, release, relents, reliant, relined, relines, relists, renails, renests, rentals, resails, resales, resands, rescale, rescans, rescind, reseals, reseats, resects, reseeds, resends, resents, resides, reslant, reslice, restain, retails, retains, retiled, retiles, retinal, retinas, sailers, sainted, salient, salines, saltern, saltier, sanders, sandier, sardine, sateens, satires, scalene, scalers, scalier, scanter, scarlet, scented, scenter, sclerae, scleras, screeds, screens, sealers, seances, seaside, seaters, secants, seceder, secedes, secerns, secrete, secrets, sedater, sedates, seeders, seedier, seitans, seitens, selects, senates, senders, sensate, serials, seriate, sestina, sestine, sidecar, sidlers, silanes, silence, silents, sincere, sinters, slander, slanted, slaters, slatier, sleeted, slender, slicers, sliders, snailed, snarled, sneered, snidest, stained, stainer, stances, standee, stander, stealer, steeled, steelie, steered, stencil, sterane, sterile, sternal, sterned, strains, strands, strides, tasered, tealess, teasels, teasers, teenier, tenders, tendril, tensile, tieless, tinders, tinsels, tirades, tradein, trailed, trained, trainee, tranced, trances, treacle, treadle, trenail, tressed, triaene, trienes