The word waterproofing 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: 25
Highest Scoring Words With Friends™ Play In The Letters waterproofing
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Seven Letter Word Alert: (98 words)
airport, angrier, earring, egotrip, engraft, fainter, fearing, figwort, fireant, firepan, firepot, footage, footing, forager, foreign, forgoer, forgone, forwarn, forwent, frigate, fringer, frowner, goofier, goopier, grafter, grainer, granite, granter, groaner, ingraft, ingrate, ironage, operant, oranger, orating, oration, oregano, ornater, otarine, painter, parting, partner, pertain, petifog, pointer, poofier, poofing, portage, porting, portion, praetor, prating, prawner, printer, profane, pronate, proofer, prorate, protean, protein, rafting, ragwort, rangier, reaping, rearing, refrain, regraft, regrant, regrown, repaint, repoint, reprint, reproof, retrain, rewrapt, roaring, roofing, rooting, tangier, tarring, tawnier, tearing, terrain, tinware, towrope, trainer, trooper, twanger, twoonie, wafting, warping, warring, wartier, wearing, wiretap, woofing, wringer, wronger