The word desalination 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: 16
Highest Scoring Words With Friends™ Play In The Letters desalination
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Seven Letter Word Alert: (78 words)
adonise, aeolian, alanine, aliased, andante, anilide, aniline, anneals, annelid, anodise, anoints, antlion, asinine, atonias, dailies, daltons, delints, denials, dentals, dentils, dentins, destain, details, detains, dilates, doilies, donates, edition, elastin, elation, elision, entails, idolise, idolist, indents, indians, indites, indoles, inlands, inlines, inosine, inosite, instead, intends, intoned, intones, iodines, iodites, iolites, ionised, isolate, leantos, liaised, liaison, lindens, linnets, lionets, lionise, nailset, nations, nondate, nondiet, nonlate, nonlead, nonsale, oiliest, sainted, salient, sealant, sealion, sidelit, slanted, snailed, stained, talonid, tendons, tension, toenail