The word tidelands 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: 13
Highest Scoring Words With Friends™ Play In The Letters tidelands
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Seven Letter Word Alert: (22 words)
dandies, dandles, delints, denials, dentals, dentils, destain, details, detains, dilated, dilates, distend, elastin, entails, instead, laddies, nailset, sainted, salient, slanted, snailed, stained