The word hydrostatics 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™ Plays In The Letters hydrostatics
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Seven Letter Word Alert: (38 words)
artists, astroid, carotid, castors, chariot, charity, chytrid, citator, costars, cystoid, cytosis, diarchy, distort, drastic, hairdos, haricot, history, orchids, ostrich, racists, rattish, rhotics, ricotta, scorias, starchy, statics, straits, taoists, tartish, thirsts, thirsty, throats, throaty, thyroid, toadish, tricots, tsarist, yttrias