The word blackmailing 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: 30
Highest Scoring Words With Friends™ Play In The Letters blackmailing
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Seven Letter Word Alert: (33 words)
aclinal, albinal, albinic, alginic, alkalic, ambling, bacilli, backing, bailing, balking, balling, bilking, billing, billman, blaming, cabling, calling, calming, cambial, glacial, kalimba, killing, lacinia, lacking, lambing, laminal, licking, magical, mailbag, mailing, manilla, milking, milling