The word stegosauruses 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 stegosauruses
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Seven Letter Word Alert: (45 words)
arouses, asserts, assorts, assures, augusts, austere, auteurs, estrous, euaster, gaseous, gassers, gearset, gesture, goatees, grasses, greases, grosses, grouses, guesser, guesses, gussets, oestrus, ousters, outages, outrage, outsees, ragouts, reseats, restage, roseate, russets, seagoer, seaters, sourest, stagers, stereos, storage, sutures, teasers, toruses, tossers, tresses, trusses, ureases, urostea