The word driveshafts 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: 21
Highest Scoring Words With Friends™ Play In The Letters driveshafts
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Seven Letter Word Alert: (56 words)
adverts, adviser, advises, aridest, ashiest, astride, avidest, dashers, dearths, dervish, disrate, dithers, diverts, divests, fairest, fathers, fiestas, fishers, hafters, hardest, harvest, hastier, hatreds, rashest, ratfish, redfish, reshift, resifts, satires, shaders, shadier, shafted, shavers, sherifs, shifted, shifter, shirted, shivers, shrifts, sifters, starved, starves, stashed, stivers, strides, strifes, strived, strives, threads, thrived, thrives, tirades, trashed, trashes, verists, veritas