The word autocatalyses 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 autocatalyses
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Seven Letter Word Alert: (64 words)
acetyls, acolyte, actuals, actuate, acuates, acutely, acutest, acylase, acylate, alecost, assault, atlases, autoecy, castles, casuals, clauses, closest, closets, coastal, costate, cotylae, cotyles, culotte, cutlets, cystous, ecstasy, eustacy, eustasy, lactase, lactate, lactose, layouts, locates, locusts, lotuses, lysates, outcast, outlast, outlays, outlets, outsets, outstay, saltate, saltcat, salutes, scuttle, solaces, solutes, stalest, stately, statues, stoutly, stylate, stylets, sulcate, systole, tactual, taluses, testacy, toluate, tousles, toyless, tyloses, tylotes