The word fugaciousness 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 fugaciousness
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Seven Letter Word Alert: (43 words)
agnosic, agonies, agonise, assigns, caisson, caseins, casings, casinos, cassons, causing, ceasing, cession, cognise, coinage, confess, confuse, cosigns, cosines, cousins, cussing, facings, fancies, fiances, focuses, fucoses, fungous, fusions, fussing, gaseous, guineas, gussies, igneous, infuses, osseins, sassing, saucing, seafogs, seasons, session, sinuous, sinuses, uncages, unfocus