The word pranksters 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: 18
Highest Scoring Words With Friends™ Play In The Letters pranksters
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Seven Letter Word Alert: (37 words)
aptness, arrests, entraps, errants, panters, parents, parsers, partner, pasters, pranker, praters, pretans, rankers, rankest, ranters, raspers, rasters, reparks, repasts, resnaps, respans, restrap, retasks, retraps, skaters, snarers, spanker, sparers, sparest, sparker, sparser, starers, starker, streaks, tankers, taskers, trepans