The word prehistories 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: 17
Highest Scoring Words With Friends™ Play In The Letters prehistories
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Seven Letter Word Alert: (67 words)
erotise, heiress, heptose, heroise, hessite, heteros, hissier, horsier, hosiers, persist, pesters, pieties, pissier, pithier, pitiers, poesies, poetess, poetise, porters, posters, pothers, presets, presort, presser, priests, rehires, reports, reposer, reposes, reposts, repress, reprise, reships, reshoes, reshore, resorps, resorts, respire, respite, respots, resteps, resters, restirs, restore, retires, retries, rhetors, rioters, roister, ropiest, rosehip, rosiest, rosters, shorter, soirees, sorters, sorties, spheres, spirits, spriest, sprites, stereos, stories, striper, stripes, strophe, tipsier