The word sinistrality 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: 16
Highest Scoring Words With Friends™ Play In The Letters sinistrality
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Seven Letter Word Alert: (22 words)
artists, initial, instars, lyrists, nastily, nattily, nitryls, raisins, saintly, starlit, statins, strains, straint, straits, stylist, tastily, transit, trinity, trysail, tsarist, tyrants, yttrias