The word waterlessness 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: 18
Highest Scoring Words With Friends™ Play In The Letters waterlessness
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Seven Letter Word Alert: (67 words)
answers, antlers, artless, assents, asserts, aweless, earless, earnest, eastern, elaters, enseals, ensears, enteral, entrees, eternal, lateens, leaners, leanest, leasers, lessees, lessens, nearest, nesters, nestles, netless, rawness, realest, relates, release, relents, renests, renewal, rentals, resales, reseals, reseats, resents, reslant, saltern, sateens, sealers, seaters, seesaws, senates, sensate, slaters, stealer, sterane, sternal, sweater, sweeten, sweeter, swelter, tassels, tealess, teasels, teasers, tresses, wanters, warless, wasters, weasels, western, wetness, wrasses, wrenlet, wrestle