The word breakthroughs 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: 27
Highest Scoring Words With Friends™ Play In The Letters breakthroughs
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Seven Letter Word Alert: (78 words)
aborter, abortus, arbours, arguers, arouser, authors, barkers, barters, bathers, boaster, boaters, borages, borates, bothers, brasher, breaths, brogues, brokers, brother, brought, brusher, burgers, bursage, bursate, earshot, garrets, garters, gathers, goburra, graters, grouser, grouter, harbors, harbour, harsher, hearths, herbous, hoarser, hurrahs, hurters, obtuser, outages, outbake, outbark, outbegs, outbrag, outrage, ragouts, rebaths, reboast, rebrush, reburst, regrabs, regrout, reroast, retours, rhetors, roaster, rougher, routers, rugrats, sharker, shorter, shouter, sorbate, starker, storage, stroker, sugarer, through, tougher, tourers, trasher, troughs, trouser, turgors, urethra, urostea