The word anisotropic 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: 18
Highest Scoring Words With Friends™ Plays In The Letters anisotropic
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Seven Letter Word Alert: (40 words)
actions, apricot, aspirin, atonics, cantors, cantrip, caption, captors, cartons, cartoon, cations, catnips, citrons, consort, coronas, cratons, iconist, incisor, nicosia, options, oration, patrons, pianist, piarist, porotic, portico, portion, potions, prootic, prosaic, protons, psionic, racoons, rations, satiric, scorpio, soprano, sporont, torsion, tropics