The word biocatalysts 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: 21
Highest Scoring Words With Friends™ Play In The Letters biocatalysts
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Seven Letter Word Alert: (21 words)
abyssal, altoist, basalts, blastic, bossily, catboat, cattail, cattily, coastal, cobalts, cytosis, saltcat, socials, statics, stoical, stylist, tabasco, tacitly, taoists, tastily, tylosis