The word preoperative 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 preoperative
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Seven Letter Word Alert: (31 words)
airport, approve, averter, epitope, etaerio, operate, overate, overeat, overtip, paperer, peatier, pervert, pivoter, praetor, prepare, pretape, private, prorate, rapport, repaper, repaver, repivot, reprove, retiree, reverie, riveter, taperer, tearier, trapper, tripper, vaporer