The word slipperworts 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: 22
Highest Scoring Words With Friends™ Plays In The Letters slipperworts
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Seven Letter Word Alert: (87 words)
estriol, lispers, loiters, loppers, lorries, lossier, oppress, ostlers, owliest, persist, petrols, pisspot, pistols, pitless, plowers, plowter, politer, porters, posters, postils, potpies, preplot, presort, priests, propels, prosper, prowess, prowler, relists, repilot, replots, replows, reports, reposts, resoils, resorps, resorts, resplit, respots, restirs, rioters, rippers, rippler, ripples, ripplet, ripstop, roister, ropiest, rosiest, rosters, sippers, slipper, slopers, slowest, soppers, soppier, sorrels, sorters, sorties, spoiler, spriest, sprites, sterols, stipple, stopper, stories, striper, stripes, swipers, swirler, swopper, tipless, tippers, tippler, tipples, toilers, topless, toppers, topples, triples, tripole, tripper, trowels, twirler, witless, worries, writers