The word ferociousness 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: 21
Highest Scoring Words With Friends™ Play In The Letters ferociousness
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Seven Letter Word Alert: (69 words)
censers, censors, censure, cerises, cession, coiners, confers, confess, confuse, conifer, cosines, courses, cousins, cresses, cronies, crosses, cruises, cussers, encores, enforce, ensures, erosion, fencers, fescues, finesse, fissure, focuser, focuses, forseen, frescos, fucoses, fusions, fussers, fussier, infuser, infuses, infusor, insures, issuers, necrose, noosers, oncosis, onerous, osseins, osseous, recoins, recuses, refines, refocus, refuses, reissue, rescues, scissor, screens, secerns, secures, seniors, sensors, serious, session, sincere, sinuses, soirees, sooners, sources, sucrose, sunrise, sunroof, uncross