The word dishwater 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: 15
Highest Scoring Words With Friends™ Play In The Letters dishwater
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Seven Letter Word Alert: (27 words)
aridest, astride, dearths, disrate, dithers, hardest, hastier, hatreds, rawhide, rethaws, shadier, shirted, steward, strawed, swathed, threads, tirades, trashed, waisted, waiters, wariest, wearish, withers, wraiths, wreaths, writhed, writhes