The word lithospheres 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 lithospheres
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Seven Letter Word Alert: (92 words)
elopers, epistle, erotise, estriol, heiress, helpers, heptose, heroise, hessite, heteros, holiest, holster, hoplite, hosiers, hostels, hostile, hostler, isohels, lispers, loiters, lossier, osselet, ostlers, pelites, pelters, perlite, persist, pesters, pestles, petiole, petless, petrels, petrols, philter, philtre, phisher, pieless, pistols, pitless, poesies, poetess, poetise, politer, posters, postils, pothers, presets, priests, relists, repiles, repilot, replies, replots, reposes, reposts, reptile, reships, reshoes, resoils, resoles, respelt, respite, resplit, respots, resteps, retiles, ropiest, rosehip, roselet, rosiest, shelter, slither, slopers, soirees, sorties, spheres, spoiler, spriest, sprites, stereos, sterile, sterols, stories, stripes, strophe, tieless, tipless, toeless, toilers, topless, triples, tripole