The word mailsorters 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: 15
Highest Scoring Words With Friends™ Play In The Letters mailsorters
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Seven Letter Word Alert: (98 words)
aimless, airless, armless, armlets, armoire, armrest, arrests, artless, artsier, atomise, estriol, isolate, isomers, lassoer, loamier, loiters, lorries, lossier, maestro, mailers, maltier, maltose, marlite, marries, masters, misseat, missort, misters, mistral, mitoses, moister, molests, morales, morsels, mortals, mortars, mortise, mossier, motlier, oarless, ostlers, raisers, rasters, realism, realist, realtor, relists, remails, reroast, resails, resoils, resorts, restirs, retails, retrial, retrims, rimless, rioters, roamers, roaster, roister, rosiest, rosters, rostral, sailers, sailors, saltier, satires, seamost, serials, sierras, slaters, slatier, smarter, smartie, smilers, smiters, soarers, somites, sorrels, sortals, sorters, sorties, starers, sterols, stomies, stories, streams, stroams, stromal, tailors, tarries, toilers, trailer, tramels, tremors, trimers, tsarism