The word preciousness 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: 20
Highest Scoring Words With Friends™ Play In The Letters preciousness
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Seven Letter Word Alert: (88 words)
censers, censors, censure, cerises, cession, coiners, copiers, corpses, cosines, courses, cousins, cresses, crispen, cronies, crosses, cruises, cuprene, cussers, encores, ensures, epicure, espouse, eupneic, insures, issuers, necrose, openers, osseins, penises, peonies, percuss, persons, peruses, pierces, pincers, pioneer, poesies, porcine, poseurs, pouncer, pounces, precise, presses, princes, prisons, process, prussic, purines, pussier, pussies, recipes, recoins, recoups, recuses, reissue, reopens, repines, reposes, rescope, rescues, respice, respins, scissor, screens, secerns, secures, seniors, sensors, serious, session, sincere, sinuses, snipers, soirees, soupier, sources, species, spicers, spinose, spinous, spouses, spruces, sucrose, sunrise, suspire, uncross, uprisen, uprises