The word osteopetrosis 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: 16
Highest Scoring Words With Friends™ Play In The Letters osteopetrosis
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Seven Letter Word Alert: (64 words)
erotise, isotope, oospore, persist, pesters, petites, pettier, poesies, poetess, poetise, poorest, poroses, porosis, possets, posters, potters, potties, presets, presses, pretest, priests, protest, protist, reposes, reposts, resists, respite, respots, resteps, retests, risotto, ropiest, rosette, rosiest, septets, sestets, setters, sisters, sitters, soirees, sootier, sorties, spotter, spriest, sprites, stereos, stooper, stories, streets, stripes, tersest, testers, testier, tipster, tiptoer, tiptoes, tooters, tootsie, tossers, tosspot, treetop, tresses, tropist, tsetses