The word blockbusters 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: 27
Highest Scoring Words With Friends™ Play In The Letters blockbusters
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Seven Letter Word Alert: (98 words)
becrust, becurls, bescour, besorts, blesbok, blocker, blouses, bluster, bolster, bolters, boluses, brocket, buckets, buckler, buckles, burbles, buskers, busters, bustler, bustles, butlers, clobber, closers, closest, closets, closure, cloture, clubber, cluster, cobbers, cobbler, cobbles, cobless, colters, corsets, coulter, courses, cresols, cubless, elutors, escorts, estrous, lobbers, lobster, lockers, lockets, lockset, locusts, lotuses, lusters, obscure, obtuser, oestrus, ostlers, ousters, reblock, relocks, restock, restuck, results, rockets, roebuck, rubbles, rustles, scouter, sculker, sectors, slobber, sobbers, sockets, solutes, sorbets, sources, sourest, sterols, stocker, stokers, strobes, strokes, stubble, sublets, subsect, subslot, subsort, subtler, suckers, suckler, suckles, sucrose, sulkers, sutlers, toruses, tousles, trouble, truckle, tubless, tuckers, tuskers