The word sorrowfulest 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 sorrowfulest
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Seven Letter Word Alert: (64 words)
elutors, estrous, felwort, ferrous, florets, flouter, flowers, fluster, fluters, footers, forests, fosters, foulest, fowlers, froster, frowsts, furlers, furless, furrows, loosest, looters, lotuses, lusters, oestrus, ostlers, ourself, ousters, outflew, outflow, outsole, outwore, reflows, refurls, reroofs, reroots, resorts, restful, results, retools, retours, roofers, rooster, rooters, rosters, routers, rustler, rustles, slowest, solutes, sorrels, sorrows, sorters, sourest, sterols, surfers, sutlers, toolers, toruses, tourers, tousles, trouser, trowels, twofers, woofers