The word xerostomias 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: 21
Highest Scoring Words With Friends™ Play In The Letters xerostomias
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Seven Letter Word Alert: (30 words)
atomise, isomers, maestro, masters, misseat, missort, misters, mitoses, moister, mortise, mossier, osteoma, rosiest, satires, seamost, searoom, smartie, smiters, somites, sootier, sorties, stomies, stories, streams, stroams, tearoom, toxemia, tsarism, xeromas, xerosis