The word tropospheres 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: 20
Highest Scoring Words With Friends™ Plays In The Letters tropospheres
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Seven Letter Word Alert: (57 words)
heptose, heteros, hoppers, opposer, opposes, oppress, pesters, poetess, poopers, poorest, poroses, porters, posters, pothers, presets, presort, presser, prophet, propose, prosper, reports, reposer, reposes, reposts, repress, reroots, reshoes, reshoot, reshore, resorps, resorts, respots, resteps, resters, restore, rhetors, rooster, rooters, rosters, shooter, shopper, shorter, soother, soothes, soppers, sorters, spheres, stepper, steppes, stereos, stooper, stopper, strophe, toppers, toprope, torpors, trooper