The word prosperities 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 prosperities
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Seven Letter Word Alert: (67 words)
epitope, erotise, oppress, peptise, persist, pesters, pieties, pissier, pisspot, pitiers, poesies, poetess, poetise, porters, posters, potpies, presets, presort, presser, priests, prosper, repipes, reports, reposer, reposes, reposts, repress, reprise, resorps, resorts, respire, respite, respots, resteps, resters, restirs, restore, retires, retries, rioters, rippers, ripstop, roister, ropiest, rosiest, rosters, sippers, soirees, soppers, soppier, sorters, sorties, spirits, spriest, sprites, stepper, steppes, stereos, stopper, stories, striper, stripes, tippers, tippier, tipsier, toppers, tripper