The word upholsters 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 upholsters
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Seven Letter Word Alert: (50 words)
elutors, estrous, holster, hostels, hostler, hotspur, hurtles, hustles, leprous, lotuses, lushest, lusters, oestrus, ostlers, ousters, petrols, plouter, plusher, poseurs, posters, posture, pothers, poulter, pouters, pulsers, pushers, replots, reposts, respots, results, rustles, shouter, sleuths, slopers, slusher, solutes, sourest, sporule, spouter, sprouts, sterols, strophe, stupers, stupors, sutlers, topless, toruses, tousles, troupes, upshots