The word quarterfinal 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: 27
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (41 words)
airfare, antique, aquifer, failure, fainter, fantail, fireant, flirter, frailer, funeral, inflate, latrine, lunaria, narrate, natural, neutral, quantal, quarrel, quarter, quilter, ratline, refrain, refutal, reliant, retinal, retrain, retrial, runtier, tailfan, tearful, tequila, terrain, trailer, trainer, trenail, trifler, turfier, unalert, unalter, uralite, urinate