The word provincialisms 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: 29
Highest Scoring Words With Friends™ Play In The Letters provincialisms
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Seven Letter Word Alert: (65 words)
aspirin, avionic, caisson, campion, casinos, casspir, clamors, clarion, compass, crampon, crimson, iconism, impairs, incisor, inclasp, isospin, liaison, lionism, lipomas, marconi, marlins, masonic, microns, miscoin, misplan, mission, monilia, mosaics, nicosia, normals, oilcans, parsons, passion, plasmin, plasmon, polaric, prismal, prisons, prosaic, psalmic, psionic, racisms, raisins, ransoms, ravioli, rosalic, sailors, salmons, saviors, scorias, scrimps, silicas, silicon, silvans, simians, similar, sirloin, socials, spasmic, spinals, spirals, sprains, violins, virions, visions