The word redetermined 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: 18
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (31 words)
demerit, derider, dernier, detrend, dimeter, emended, emender, entered, enterer, inerter, merited, metered, mitered, miterer, needier, nerdier, redried, reedier, reenter, reinter, remined, retimed, retimer, retired, retiree, retreed, retried, teenier, tireder, trended, trireme