The word dishtowels 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: 17
Highest Scoring Words With Friends™ Play In The Letters dishtowels
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Seven Letter Word Alert: (20 words)
delists, desilts, doltish, dotless, dowsets, hoisted, holiest, hostels, hostile, isohels, owliest, shields, sloshed, slowest, slowish, swished, whistle, wholist, wildest, witless