The word nonrepetitive 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 nonrepetitive
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Seven Letter Word Alert: (35 words)
entente, environ, inepter, intoner, invitee, inviter, invitro, nitrene, nitrite, nittier, overtip, pentene, pettier, pioneer, pivoter, pointer, pontine, portent, prenote, preteen, prevent, protein, repivot, repoint, teenier, tentier, terpene, terpine, tinnier, tintier, tiptoer, treetop, veinier, vintner, vitrine