The word heatstrokes 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: 17
Highest Scoring Words With Friends™ Plays In The Letters heatstrokes
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Seven Letter Word Alert: (53 words)
arkoses, earshot, estates, hatters, hearses, heaters, heteros, kashers, ketoses, koshers, rashest, reheats, reseats, reshake, reshoes, resoaks, restake, restate, restoke, retakes, retasks, retaste, retests, retoast, roseate, rosette, rotates, seaters, setters, shakers, shatter, skaters, soakers, staters, stereos, stokers, streaks, streets, strokes, taskers, tasters, teasers, tersest, testers, tethers, theater, theatre, thereat, thereto, threats, throats, toaster, trashes