The word loosestrifes 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 loosestrifes
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Seven Letter Word Alert: (66 words)
erotise, estriol, felsite, fertile, festers, filters, florets, florist, flosses, foister, footers, footsie, forelie, forests, forties, fossils, fosters, lefties, lessors, lifters, loftier, loiters, loosest, looters, lossier, oolites, orioles, osselet, ostlers, refiles, reflies, reliefs, relists, resifts, resists, resoils, resoles, retiles, retools, roselet, rosiest, selfies, sessile, sifters, sisters, softies, soirees, soloist, sootier, sorties, stereos, sterile, sterols, stifler, stifles, stoolie, stories, strifes, tieless, toeless, toilers, toolers, tossers, trefoil, tresses, trifles