The word impermeability 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™ Plays In The Letters impermeability
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Seven Letter Word Alert: (60 words)
ability, airtime, ammeter, balmier, beamlet, beermat, belayer, bilayer, biliary, bimetal, bleater, emirate, emptier, emptily, empyema, impaler, imperil, impiety, irately, lamprey, laytime, lempira, liberty, limiter, maltier, marlite, marmite, mealier, meatier, meatily, meatpie, metamer, militar, militia, palmier, peatier, perlite, prelate, prelaty, premelt, primate, pteryla, reality, reblame, replait, replate, repleat, reptile, tearily, tempera, timbale, timbrel, trammel, trample, tremble, trembly, triable, typebar, yealmer, yperite