The word reassailing 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: 15
Highest Scoring Words With Friends™ Play In The Letters reassailing
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Seven Letter Word Alert: (52 words)
aerials, airings, airless, airline, aisling, aliases, aligner, anglers, arising, arsenal, erasing, gainers, galenas, gassier, genials, girlies, girnels, ingress, laagers, lairing, largess, lasagne, learing, leasing, liaises, ligases, lingers, nailers, railing, raising, raisins, realign, regains, regalia, renails, resails, resigns, risings, sailers, sailing, salines, sangria, sealing, searing, serials, signals, signers, silanes, singers, singles, slinger, sringas