The word ankylosauruses 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: 24
Highest Scoring Words With Friends™ Play In The Letters ankylosauruses
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Seven Letter Word Alert: (50 words)
alkanes, alkynes, analyse, areolas, arkoses, arousal, arouses, arsenal, assayer, assures, aureola, elusory, ensouls, karyons, knaurle, knaurls, knaurly, korunas, lassoer, lassoes, lessons, lessors, loaners, neurula, oarless, orleans, rayless, reasons, reassay, reloans, resoaks, seasons, selsyns, sensors, sensory, sensual, skyless, slayers, slyness, snorkel, soakers, sonless, sulkers, sunless, sunrays, unlayer, unseals, yankers, yonkers, younker