The word antitrades 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: 12
Highest Scoring Words With Friends™ Plays In The Letters antitrades
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Seven Letter Word Alert: (55 words)
airdate, antsier, aridest, artiest, artisan, astride, atresia, attains, attends, attired, attires, dataset, dentist, destain, detains, detrain, disrate, distant, instate, instead, iratest, nastier, natters, nattier, nitrate, radians, radiant, radiate, restain, retains, retinas, retints, sainted, sandier, sardine, satiate, stained, stainer, stander, started, stinted, straint, striate, tainted, tartans, tastier, tiaraed, tinders, tinters, tirades, tradein, trained, transit, trident, tsarina