The word slaughterer 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™ Play In The Letters slaughterer
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Seven Letter Word Alert: (68 words)
alerter, arguers, auletes, austere, eaglets, elaters, eluates, erasure, estrual, euaster, garrets, garters, gathers, gearset, gelates, gesture, graters, greaser, greater, haglets, halters, haulers, healers, hearers, heaters, hurlers, hurters, hurtles, largest, lathers, laugher, leaguer, leagues, leather, legates, realers, realest, realter, reargue, regears, reglues, regrate, regrets, regular, rehears, reheats, relater, relates, reshare, restage, resurge, retears, reurges, rugrats, rustler, saluter, serrate, shearer, shelter, slather, stealer, sugarer, surreal, tearers, trasher, ureters, urethra, usherer