The word cancellation 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 cancellation
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Seven Letter Word Alert: (37 words)
aclinal, aconite, aeolian, alanine, alicant, aloetic, ancient, antlion, cacolet, calcine, calcite, calicle, cannoli, canonic, catcall, catenin, cloacae, cloacal, coalite, cocaine, coeliac, collate, collect, conceal, conceit, conical, connect, contain, elation, laconic, lacteal, lactone, lanolin, lection, nonlate, oceanic, toenail