The word redetermines 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (82 words)
dements, demerit, demesne, deniers, dernier, derries, desirer, destine, diester, dieters, dimeter, eeriest, emender, emersed, enemies, entered, enterer, entrees, entries, inerter, meeters, menders, merited, metered, metrise, minders, mindset, minters, mitered, miterer, needers, needier, nerdier, redeems, redries, reedier, reedits, reemits, reenter, reested, reinter, remeets, remends, reminds, remined, remines, remints, renders, renters, rerents, rerinse, resider, retimed, retimer, retimes, retired, retiree, retires, retreed, retrees, retried, retries, retrims, seedier, serener, sneered, sneerer, steered, steerer, sterned, sterner, stirred, strider, teemers, teenier, tenders, tinders, tireder, tridems, trienes, trimers, trireme