The word bellicoseness 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 bellicoseness
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Seven Letter Word Alert: (31 words)
beeline, bellies, binocle, blesses, blisses, cession, cobless, collies, collins, cosines, ebonics, ebonies, enclose, essence, iceless, illness, insoles, lesions, lessees, lessens, lessons, license, lioness, obscene, osseins, ossicle, sessile, session, silence, sinless, sonless