The word conscientiousness cannot be made in Words With Friends™. It is 17 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Play In The Letters conscientiousness
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Seven Letter Word Alert: (72 words)
cenotes, cession, ciscoes, coconut, coesite, conceit, concise, concuss, connect, connote, consent, consist, cooties, cosiest, cosines, cousins, cuisine, ensuite, entices, eosinic, iciness, iconist, incense, incests, incises, incites, inosine, inosite, insects, insists, intense, intones, ionises, ionones, noncute, nonenes, nonsuit, nosiest, notices, notions, octenes, oecists, oncosis, oncotic, oneness, osseins, osseous, osteons, outsees, science, sconces, section, seitens, session, sestine, sinuses, sissies, sonnets, soonest, stenose, stuccos, success, suction, sunnies, sunsets, tension, tissues, tocsins, toonies, unction, unities, unstoic