The word tropopauses 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™ Play In The Letters tropopauses
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Seven Letter Word Alert: (58 words)
apposer, apposes, arouses, estrous, oestrus, opposer, opposes, oppress, ousters, outraps, outsoar, outspar, papoose, passout, pasters, pasteup, pastors, pasture, paupers, poopers, poorest, poroses, poseurs, posters, posture, pouters, pressup, propose, pupates, purpose, repasts, reposts, respots, sappers, seaport, soapers, soppers, sourest, soursop, sparest, spouter, sprouts, stepups, stooper, stopper, stupers, stupors, suppers, support, suppose, tappers, toppers, toprope, toruses, troupes, uprates, uproots, urostea