The word idiosyncratic 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: 23
Highest Scoring Words With Friends™ Play In The Letters idiosyncratic
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Seven Letter Word Alert: (47 words)
accords, acidity, actinic, actions, arctics, aridity, astroid, atonics, candors, cantors, carotid, cartons, cations, citrons, coarcts, conidia, corands, cratons, crayons, cricoid, crinoid, critics, cryonic, cyanids, cyanoid, cystoid, diarist, diction, discant, donairs, drastic, iconist, idiotic, incisor, indicts, inroads, nicosia, nordics, octadic, ordains, rations, satiric, sciatic, scoriac, soricid, synodic, triadic