The word inoperative 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: 19
Highest Scoring Words With Friends™ Play In The Letters inoperative
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Seven Letter Word Alert: (34 words)
arenite, etaerio, inepter, inertia, invitee, inviter, invitro, operant, operate, otarine, overate, overeat, overtip, painter, peatier, pertain, pioneer, pivoter, pointer, prenote, prevent, private, pronate, protean, protein, repaint, repivot, repoint, terpine, trainee, triaene, veinier, veteran, vitrine