The word nonappearances 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: 26
Highest Scoring Words With Friends™ Play In The Letters nonappearances
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Seven Letter Word Alert: (37 words)
acerose, appears, appease, apposer, canapes, cannons, canoers, careens, coarsen, coppers, corneas, encores, ensnare, escaper, nappers, necrose, nonanes, nonenes, nonsane, openers, panacea, penance, pencase, penners, persona, prances, propane, propene, recanes, reopens, repaces, rescope, respace, rosacea, scanner, snapper, spanner