The word blacklisting 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: 27
Highest Scoring Words With Friends™ Plays In The Letters blacklisting
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Seven Letter Word Alert: (57 words)
aisling, albinic, albitic, alginic, anglist, bacilli, backing, backlit, bailing, baiting, balking, balling, basking, basting, biasing, bilking, billing, bitings, blastic, cabling, calling, casting, catkins, install, instill, intagli, italics, killing, kilting, lacings, lacking, lasting, licking, likings, lilting, listing, sacking, sailing, salting, scaling, sibling, sickbag, sicking, silting, skating, slating, slicing, staking, tabling, tacking, tailing, takings, talking, tasking, ticking, tilings, tilling