The word mycobacterium 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: 31
Highest Scoring Words With Friends™ Play In The Letters mycobacterium
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Seven Letter Word Alert: (34 words)
acerbic, aerobic, amoebic, autoecy, boracic, breccia, bromate, bromite, brucite, brumate, cambium, cambric, caribou, cautery, ceramic, cometic, commute, emacity, erotica, iceboat, icetray, marmite, microbe, muriate, mycotic, myotube, octamer, outrace, racemic, raucity, terbium, tumeric, uraemic, yummier