The word southwesters 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: 18
Highest Scoring Words With Friends™ Plays In The Letters southwesters
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Seven Letter Word Alert: (37 words)
estrous, heteros, hostess, oestrus, ousters, outsees, outsets, rehouse, reshoes, reshows, retests, rosette, russets, sestets, setters, shouter, showers, shutter, sourest, stereos, stouter, streets, tersest, testers, tethers, thereto, thrusts, toruses, tossers, touters, tresses, trusses, trustee, tsetses, tutoree, wetters, whereto