The word bluestones 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: 16
Highest Scoring Words With Friends™ Plays In The Letters bluestones
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Seven Letter Word Alert: (33 words)
blouses, boletes, boluses, bonelet, boneset, bonuses, bustles, butenes, eluents, enbuses, ensouls, lotuses, nestles, netless, noblest, osselet, outsees, solutes, stenose, sublets, subnets, subnote, subslot, subtone, sunbelt, toeless, toluene, tousles, tubless, unbelts, unbless, unblest, unbolts