The word rottenstones 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: 14
Highest Scoring Words With Friends™ Plays In The Letters rottenstones
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Seven Letter Word Alert: (31 words)
estrone, nesters, netters, noosers, oneness, osteons, renests, rennets, resents, retests, rosette, setters, snotter, sonnets, sooners, soonest, stenose, stereos, stetson, stoners, streets, tenners, tensest, tensors, tenters, tersest, testers, tonette, tooters, tornote, totters