The word overrefinement 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: 26
Highest Scoring Words With Friends™ Play In The Letters overrefinement
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Seven Letter Word Alert: (42 words)
eminent, emotive, enterer, envenom, environ, ferment, fermion, ferrite, fervent, firemen, foremen, forever, freemen, inerter, inferno, intoner, mention, miterer, nervier, netform, nitrene, nominee, nonfire, nonfree, oftener, onetime, reefier, reenter, referee, refiner, reinter, remoter, remover, renerve, retimer, retiree, reverie, riveter, teenier, trireme, vintner, vomiter