The word adulteress 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: 13
Highest Scoring Words With Friends™ Play In The Letters adulteress
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Seven Letter Word Alert: (61 words)
alerted, altered, artless, assured, auletes, austere, dealers, dearest, delates, desalts, deserts, dessert, duelers, dusters, earless, elaters, eldress, eluated, eluates, eluders, estrual, euaster, leaders, leasers, lusters, realest, reasted, redates, redeals, redealt, related, relates, resales, reseals, reseats, results, rustled, rustles, saluted, saluter, salutes, sauteed, sealers, seaters, sedater, sedates, slaters, stealer, strudel, sudates, sutlers, taluses, tasered, tealess, teasels, teasers, treadle, tressed, trussed, tussled, ureases