The word jumpstarting 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: 31
Highest Scoring Words With Friends™ Play In The Letters jumpstarting
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Seven Letter Word Alert: (61 words)
airguns, amusing, armpits, atriums, gastrin, guitars, imparts, impugns, intrust, jumping, jutting, margins, martins, matings, matting, migrant, misturn, mustang, mutants, parings, parsing, parting, pasting, patting, pausing, prating, puritan, pursing, putting, rasping, ratings, ratting, rumping, rusting, rutting, sparing, spuming, staring, startup, stating, straint, stratum, stuping, suntrap, tamping, tantrum, tapings, tasting, tauting, transit, triptan, truants, tsunami, turnips, ungrasp, unpairs, unstrap, unstrip, untraps, upstair, upstart