The word interspersals 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: 18
Highest Scoring Words With Friends™ Plays In The Letters interspersals
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Seven Letter Word Alert: (301 words)
aeriest, airless, alerter, alpeens, alpines, antlers, antsier, aplites, aptness, arenite, arrests, artless, artsier, asepses, asepsis, asperse, aspirer, aspires, assents, asserts, earless, earlier, earners, earnest, easiest, eastern, elapses, elastin, elaters, enlists, enseals, ensears, entails, enteral, entraps, entries, epistle, erasers, errants, eternal, inepter, inerter, inserts, instars, insteps, lassies, lateens, latrine, leaners, leanest, leapers, learner, leasers, lenites, lessens, lineate, lipases, lispers, listens, nailers, nailset, napless, nastier, nearest, nesters, nestles, netless, painter, palsies, palters, pansies, panters, panties, parents, paresis, parsers, parties, partner, passers, pastels, pasters, pastier, pasties, patines, peatier, pelites, pelters, penises, penlite, pentail, perlite, persist, pertain, pesters, pestles, petless, petrels, pieless, pilates, pinless, pirates, pitless, plainer, planers, planets, planter, plaster, platers, pleaser, pleases, praiser, praises, praline, praters, prelate, presale, present, presets, presser, presses, pretans, priests, printer, pterins, raisers, ranters, rapists, raspers, raspier, rasters, ratline, realers, realest, realise, realist, realter, reapers, rearise, reinter, relapse, relater, relates, relearn, relents, reliant, reliers, relines, relists, renails, renests, rentals, renters, repaint, repairs, repanel, reparse, repaste, repasts, repeals, repeats, repents, repiles, repiner, repines, replait, replane, replans, replant, replate, repleat, replier, replies, repress, reprint, reprise, reptile, rerapes, rerents, rerinse, resails, resales, reseals, reseats, resents, resists, reslant, resnaps, respans, respelt, respins, respire, respite, resplit, restain, resteps, resters, restirs, restrap, retails, retains, retapes, retears, retiles, retinal, retinas, retires, retrain, retraps, retrial, retries, rinsers, sailers, salient, salines, saltern, saltier, sapless, sassier, sateens, satires, sealers, seaters, seitans, seitens, senates, sensate, serapes, serials, seriate, serpent, serrate, sessile, sestina, sestine, sierras, siestas, silanes, silents, sinless, sinters, sisters, slaters, slatier, snarers, snarler, snipers, spaniel, sparers, sparest, sparser, spearer, spelean, spinals, spinels, spinets, spirals, spireas, spleens, splines, splints, sprains, spriest, sprints, sprites, stainer, stapler, staples, starers, stealer, sterane, sterile, sternal, sterner, strains, striper, stripes, taperer, tarries, tassels, tealess, tearers, tearier, teasels, teasers, tensile, terpine, terrain, terrane, tieless, tinsels, tipless, trailer, trainee, trainer, traipse, trenail, trepans, tresses, triaene, trienes, triples