The word continuousness 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: 22
Highest Scoring Words With Friends™ Play In The Letters continuousness
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Seven Letter Word Alert: (38 words)
cession, connote, consent, consist, cooties, cosiest, cosines, cousins, incests, insects, intones, ionones, noncute, nonsuit, nosiest, notices, notions, oecists, oncosis, osseins, osseous, osteons, section, session, sinuous, sinuses, sonnets, soonest, suction, sunnies, sunsets, tension, tenuous, tissues, tocsins, toonies, unction, unstoic