The word subvocalises 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: 24
Highest Scoring Words With Friends™ Play In The Letters subvocalises
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Seven Letter Word Alert: (35 words)
abioses, aboulic, abscess, abscise, abseils, absolve, abusive, alcoves, biasses, bivouac, blisses, blouses, boluses, celosia, celsius, classes, clauses, coalise, cobless, cubless, lassies, lassoes, ossicle, sacless, scabies, sluices, socials, solaces, subcase, subsoil, vacuole, vesical, viscous, visuals, vocable