The word nightdresses 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: 18
Highest Scoring Words With Friends™ Play In The Letters nightdresses
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Seven Letter Word Alert: (85 words)
deniers, densest, deserts, designs, desires, desists, dessert, destine, diester, dieters, diether, digests, digress, dissent, dithers, dresses, edgiest, eighter, entries, genders, genesis, greisen, hedgers, heeding, heiress, heisted, herdess, herding, hessite, hinders, hissers, ingests, ingress, inserts, integer, neighed, neither, nesters, redness, reedits, regents, rehides, rehinge, reigned, renests, resends, resents, reshine, resides, resight, resigns, resists, resting, righted, sedgier, seeding, seitens, senders, sestine, shiners, shirted, shrined, shrines, sighers, sighted, sighter, signees, signers, signets, singers, sinters, sisters, snidest, sterned, stinger, strides, strings, tenders, therein, tigress, tinders, treeing, tressed, tresses, trienes