The word aggressively 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: 23
Highest Scoring Words With Friends™ Play In The Letters aggressively
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Seven Letter Word Alert: (52 words)
ageless, aggress, airless, eagerly, earless, eggless, essayer, gargles, gassier, geysers, gravels, gravely, gravies, greases, grieves, laggers, largess, laveers, leasers, leavers, ligases, rayless, realise, regives, relives, resails, resales, resaves, reseals, reveals, reviles, revises, saggers, saggier, sailers, salvers, sealers, serials, servals, servile, several, silvers, silvery, slavers, slavery, slayers, sleaves, slivers, veggies, veilers, veliger, visages