The word penetratively 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: 24
Highest Scoring Words With Friends™ Plays In The Letters penetratively
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Seven Letter Word Alert: (84 words)
aplenty, arenite, elative, elevate, enteral, entitle, entreat, eternal, evitate, inepter, ineptly, inertly, inlayer, irately, iterate, latrine, lineate, naively, naivety, nattier, nattily, nitrate, painter, palette, patient, pattern, peatier, peltate, penalty, penlite, pentail, perlite, pertain, pettier, pettily, plainer, planter, platter, plenary, praline, prattle, prelate, prelaty, preteen, prevail, prevent, private, pteryla, ptyalin, ratline, reality, reliant, relieve, repaint, repanel, replait, replane, replant, replate, repleat, replete, reptile, retinal, retitle, tearily, teenier, tentier, ternate, terpene, terpine, tertial, trainee, treelet, trenail, triaene, triplet, triptan, variety, veinlet, veneral, ventral, veteran, vinelet, yperite