The word autotomises 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: 15
Highest Scoring Words With Friends™ Play In The Letters autotomises
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Seven Letter Word Alert: (23 words)
atomise, autists, misseat, mitoses, mottoes, mutates, osteoma, outmate, outmost, outsets, outsits, seamost, situate, somites, statism, statues, stomate, stomies, taoists, timeout, tomatos, tootsie, utmosts