The word sledgehammers 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: 25
Highest Scoring Words With Friends™ Play In The Letters sledgehammers
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Seven Letter Word Alert: (75 words)
adheres, ageless, armless, damsels, dashers, dealers, deashes, degases, degerms, degrees, demerge, earless, eldress, emerald, emerged, emerges, emersed, emerses, gashers, gelders, gemless, glassed, gleamed, grassed, greased, greases, hagseed, hammers, headers, healder, healers, hearsed, hearses, hedgers, heralds, herdess, lagered, largess, lashers, leaders, leasers, leashed, leashes, ledgers, marshes, mashers, measles, meshers, message, readmes, redeals, redeems, reheels, release, resales, reseals, reseeds, sealers, seamers, seeders, shaders, shammed, shammer, sheared, sheered, slammed, slammer, slashed, slasher, sledges, smarmed, smashed, smasher, smeared, smegmas