The word trolleybuses 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: 20
Highest Scoring Words With Friends™ Plays In The Letters trolleybuses
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Seven Letter Word Alert: (79 words)
besorts, blesser, blouses, bluster, boletes, bolster, bolters, boluses, bullets, busters, bustler, bustles, butlers, elusory, elutors, estrous, eustely, eustyle, eyebolt, lobelet, lobster, lobules, lotuses, lusters, obesely, obeyers, obtuser, oestrus, osselet, ostlers, ousters, outsees, outsell, outyell, oysters, rebells, rebless, resells, resoles, restyle, results, retells, roselet, rustles, sellers, sellout, soberly, soluble, solubly, solutes, sorbets, sourest, stereos, sterols, storeys, strobes, strolls, stylers, sublets, subslot, subsort, subtler, subtree, sutlers, sutlery, systole, tellers, tersely, toeless, tollers, toruses, tousles, toyless, trebles, trolley, trouble, tubless, tyloses, yellers