The word autocatalysis 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™ Play In The Letters autocatalysis
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Seven Letter Word Alert: (34 words)
actuals, altoist, assault, aulists, autists, casuals, cattail, cattily, coastal, cultist, cystous, cytosis, layouts, locusts, lutists, oculist, outcast, outlast, outlays, outsail, outsits, outstay, saltcat, saucily, socials, statics, stoical, stoutly, stylist, tacitly, tactual, taoists, tastily, tylosis