The word antisepticize 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: 29
Highest Scoring Words With Friends™ Plays In The Letters antisepticize
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Seven Letter Word Alert: (40 words)
aseptic, capsize, catnips, citizen, entices, incites, inscape, inspect, instate, neatest, nictate, panties, patents, patient, patines, patties, pectate, pectens, pectins, pencase, petites, pianist, piazine, picante, pieties, pietist, septate, spicate, statice, stipite, tetanic, tiepins, tiniest, tipcats, titanic, zaniest, zeatins, zincate, zincite, zipties