The word preschoolers 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: 21
Highest Scoring Words With Friends™ Play In The Letters preschoolers
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Seven Letter Word Alert: (48 words)
chooser, chooses, closers, coherer, coheres, colorer, coolers, corpses, creoles, creosol, cresols, crosser, echoers, elopers, helpers, lechers, percher, perches, pooches, porches, poroses, precool, presser, process, rechose, reclose, recolor, recross, reperch, reposer, reposes, repress, rescope, rescore, reshoes, reshore, resoles, resorps, respool, schleps, schools, schorls, scooper, scorers, slopers, sorrels, spheres, spooler