The word tetracycline 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: 22
Highest Scoring Words With Friends™ Play In The Letters tetracycline
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Seven Letter Word Alert: (72 words)
accrete, acrylic, arenite, article, calcine, calcite, cattery, cattier, cattily, central, centric, certain, circlet, citrate, cittern, clarity, clatter, clayier, cleaner, clitter, cyanite, cyclane, cyclene, cynical, eccrine, enteral, enteric, enticer, entitle, entreat, erectly, eternal, icetray, inertly, inlayer, irately, iterate, larceny, latency, latrine, lattice, lectern, licence, lineate, nattier, nattily, nectary, nictate, nitrate, ratline, reality, recital, reclean, recline, recycle, reenact, reliant, retinal, retitle, tacitly, tactile, tantric, tearily, tentier, ternate, tertial, tetanic, trainee, treacle, treacly, trenail, triaene