The word archduchesses 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 archduchesses
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Seven Letter Word Alert: (60 words)
acceder, accedes, accrued, accrues, accurse, accused, accuser, accuses, adheres, assured, assures, cachers, cashers, causers, chasers, crashed, crashes, creased, creases, creches, cresses, crusade, crushed, crushes, cussers, dashers, deashes, decares, dresses, duchess, headers, hearsed, hearses, herdess, hushers, reached, reaches, recache, recused, recuses, reduces, rescued, rescues, saucers, screech, screeds, secured, secures, seducer, seduces, shaders, sheared, shushed, shushes, succeed, success, sucrase, sudsers, ureases, ushered