The word inconclusiveness cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters inconclusiveness
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Seven Letter Word Alert: (88 words)
celcius, celsius, cession, ciscoes, clinics, colicin, concise, concuss, connive, consuls, convene, cosines, coulees, council, counsel, cousins, covines, cuisine, elision, elusion, elusive, enclose, enliven, ensouls, envious, eosinic, evinces, evulses, iceless, icicles, iciness, incense, incises, incline, inlines, inosine, insoles, insulin, inulins, invoice, ionises, lesions, lessens, lessons, leucine, licence, license, lioness, lionise, nonenes, nonevil, novices, nucleic, nucleon, occluse, olivine, oneness, osseins, ossicle, science, sconces, sessile, session, silence, silicon, sinless, sinuses, slovens, sluices, snivels, sonless, success, sunless, sunnies, uncivil, unclose, uncoils, unveils, useless, veinule, venison, venules, vesicle, vessels, vicious, violins, viscous, visions