The word faithfulness 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: 23
Highest Scoring Words With Friends™ Play In The Letters faithfulness
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Seven Letter Word Alert: (82 words)
affines, ashiest, aulists, aunties, elastin, eluants, enlists, entails, falsest, fanfish, fastens, fateful, fatness, faunish, faunist, fiestas, finales, finless, fishnet, fistful, fistula, fistule, fitness, flashes, flaunts, fluents, flushes, funfest, fustian, halites, hastens, hateful, hatfuls, hatless, hisself, hustles, infests, inflate, infuses, inhales, insults, inulase, listens, lunates, luniest, lushest, nailset, salient, salines, salutes, seitans, selfish, sensual, sestina, shuffle, shutins, silanes, silents, sinuate, sleuths, snaffle, sniffle, snuffes, snuffle, stiffen, stifles, sulfate, sulfite, sultans, sunfish, sunhats, sustain, taffies, taluses, tinfuls, tinsels, unfaith, unleash, unlists, unseals, unseats, utensil