The word aggressiveness 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 aggressiveness
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Seven Letter Word Alert: (60 words)
aggress, assigns, avenger, avenges, engages, engrave, enrages, ensears, enviers, erasing, gainers, gassers, gassier, gassing, gearing, geneses, genesis, gingers, grasses, gravies, greases, greisen, grieves, ingress, inverse, naggers, ravines, ravings, reaving, reeving, regains, regives, reneges, resaves, resigns, revenge, revises, saggers, saggier, sassier, sassing, savings, searing, serging, serving, signage, signees, signers, singers, snagger, sringas, vearing, veering, veggies, veneers, verging, versine, versing, vinegar, visages