The word ratiocinators 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: 17
Highest Scoring Words With Friends™ Play In The Letters ratiocinators
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Seven Letter Word Alert: (52 words)
actants, actions, arctans, artisan, atonias, atonics, attains, cantors, carrion, carrots, cartons, cartoon, cations, citator, citrons, consort, contort, coronas, corsair, cottons, cratons, iconist, incisor, intorts, nicosia, notator, octants, oration, orators, racoons, rancors, rations, rattons, rattoon, ricotta, risotto, rotator, satanic, satiric, station, straint, tantric, tartans, tartars, titanic, torsion, tractor, traitor, transit, tricots, trocars, tsarina