The word lactobacillus 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: 26
Highest Scoring Words With Friends™ Play In The Letters lactobacillus
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Seven Letter Word Alert: (31 words)
aboulia, aboulic, abulias, accusal, acicula, actuals, bailout, ballast, ballots, blastic, bucolic, calculi, calicos, callous, callout, catcall, caustic, clastic, clausal, cloacal, cloacas, coastal, cobalts, cubical, labials, occults, oculist, outcall, outsail, stoical, tabasco