The word murderousness 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: 20
Highest Scoring Words With Friends™ Play In The Letters murderousness
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Seven Letter Word Alert: (45 words)
demurer, dormers, dousers, dresser, dresses, endorse, endures, ensured, ensurer, ensures, eudemon, menders, moderns, mourned, mourner, mousers, moussed, mousses, murders, nursers, redness, redress, remends, remorse, remound, renders, resends, resound, resumed, resumer, resumes, rounder, ruesome, rumored, rumours, senders, sensors, sermons, snorers, sounder, sudsers, undoers, undress, urnmoss, uromere