The word plentifulness 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: 24
Highest Scoring Words With Friends™ Play In The Letters plentifulness
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Seven Letter Word Alert: (92 words)
ellipse, eluents, enlists, ensuite, epistle, felines, fellest, felsite, feltpen, fennels, fetuses, fillets, fillups, finesse, finless, fistule, fitness, flenses, fluents, fullest, funnels, funnest, funnies, illness, infests, infuses, insteps, insults, intense, lefties, lenient, lenites, lentils, lineups, linnets, lintels, lipless, listens, listful, luniest, lupines, nestles, netless, pelites, pellets, penises, penlite, pennies, penults, pestles, petless, pieless, pinenes, pinenut, pinless, pinnule, pitless, pullets, puniest, punless, seitens, selfies, sestine, silents, spinels, spinets, spinnet, spinule, spleens, splines, splints, stifles, stipule, sulfite, sullies, sunnies, tellies, tenpins, tensile, tieless, tinfuls, tinsels, tipless, tunnels, unfills, unlists, unspell, unspent, unsplit, upfills, uplifts, utensil