The word redetermining 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: 21
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (83 words)
deeming, demerge, demerit, dentine, denting, dernier, deterge, dietine, dieting, dimeter, dingier, dinting, dirtier, editing, emender, emerged, emerger, eminent, engined, entered, enterer, germier, greened, greener, greeted, greeter, grimier, grinder, grinned, grinner, ignited, igniter, inditer, inerter, integer, interim, meeting, mending, merited, metered, minding, mintier, minting, mitered, miterer, needier, needing, nerdier, nitrene, nitride, reedier, reenter, regimen, regreen, regreet, regrind, reigned, reigner, reining, reinter, remerge, remined, rending, reneged, reneger, renting, retimed, retimer, retired, retiree, retreed, retried, ringmen, teeming, teenier, tending, termini, tiering, timider, tinnier, tireder, treeing, trireme