The word heatstroke 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: 16
Highest Scoring Words With Friends™ Plays In The Letters heatstroke
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Seven Letter Word Alert: (24 words)
earshot, hatters, heaters, heteros, reheats, reshake, restake, restate, restoke, retakes, retaste, retoast, roseate, rosette, rotates, shatter, tethers, theater, theatre, thereat, thereto, threats, throats, toaster