The word antibacterial 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 antibacterial
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Seven Letter Word Alert: (67 words)
abettal, abreact, actable, airable, airline, albinic, albitic, alicant, article, balance, banaler, battier, battler, bitrate, bittier, blatant, brittle, cabaret, cabinet, caliber, calibre, cantata, carbine, carinae, carinal, cattail, cattier, central, certain, ciliate, citable, citrate, citrine, cittern, clatter, clitter, cranial, inciter, inertia, labiate, lacinia, lactate, latrine, lattice, lintier, nattier, nictate, nitrate, nitrite, nittier, ratbite, ratline, rattail, recital, reliant, retinal, tabinet, tactile, tantric, teacart, terabit, tertial, tetanic, tintier, titanic, trenail, triable