The word ostracising 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™ Plays In The Letters ostracising
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Seven Letter Word Alert: (57 words)
actions, agnosic, agonist, airings, arising, atonics, caisson, cantors, carting, cartons, casings, casinos, casting, castors, cations, citrons, coating, consist, cosigns, costars, costing, crating, cratons, gastric, gastrin, gnostic, iconist, ignitor, incisor, instars, nicosia, orating, organic, origins, racists, raising, raisins, ratings, rations, rioting, risings, satiric, scaring, scorias, scoring, signora, signors, soaring, sorting, sringas, staring, storing, strains, strings, tocsins, tossing, tracing