The word skyrocketed is playable in Words With Friends™, but 1 blank substituting for the letter 'k' is 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™ Play In The Letters skyrocketed
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Seven Letter Word Alert: (19 words)
cestode, crested, deckers, decokes, decoyer, destock, destroy, dockers, dockets, recodes, redocks, restock, restoke, rockets, sockeye, stocked, stocker, stroked, trekked