The word slipstream 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: 17
Highest Scoring Words With Friends™ Play In The Letters slipstream
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Seven Letter Word Alert: (96 words)
aimless, airless, amplest, aplites, armless, armlets, armpits, artless, aspires, impaler, impales, imparts, impasse, impress, lempira, limpest, limpets, lipases, lispers, mailers, maltier, mapless, marlite, masters, misseat, misstep, misters, mistral, palmier, palmist, palsies, palters, paresis, parties, pastels, pasters, pastier, pasties, pastime, permits, persist, pilates, pirates, pitless, plaster, platers, praises, prelims, premiss, priests, primase, primate, prismal, rapists, realism, realist, relists, remails, repasts, replait, resails, resplit, restamp, retails, rimless, sailers, saltier, sampler, samples, satires, serials, simpers, simpler, simples, slaters, slatier, smartie, smilers, smiters, sparest, spirals, spireas, spriest, sprites, stamper, stapler, staples, streams, stripes, tampers, tipless, traipse, tramels, trample, triples, tsarism