The word cuckoldries 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: 24
Highest Scoring Words With Friends™ Play In The Letters cuckoldries
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Seven Letter Word Alert: (55 words)
celcius, ceroids, circled, circles, clerics, clicked, clicker, clocked, clocker, closure, clucked, cockier, codices, coursed, cricked, crocked, cruised, cuckold, curdles, dockers, dockise, duckers, duckier, duckies, duskier, icecold, lickers, lockers, lousier, luckier, occlude, occluse, occuder, reclock, recocks, recoils, redocks, relocks, rodlike, scolder, scoured, sculked, sculker, sickled, skirled, slicked, slicker, sluiced, sluicer, soldier, sourced, suckier, suckled, suckler, sulkier