The word domineeringly 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: 24
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (75 words)
deeming, deleing, demerol, demoing, denying, dienyne, dingier, dingily, diynone, doyenne, droning, dyeline, eleidin, eliding, eloined, endogen, endonym, engined, ergonym, eroding, gloried, godlier, greenly, gremlin, grimily, grinned, groined, ignored, ironing, leering, lemoned, lending, limning, linemen, melding, mendigo, mending, midline, minding, mingled, mingler, modeler, moldier, molding, moneyed, mongery, mongrel, morning, myeline, myeloid, needily, needing, negroid, nominee, onliner, redline, redoing, reeling, regimen, reigned, reining, relined, relodge, relying, remined, remodel, rending, reoiled, rigidly, ringmen, roiling, yelming, yielder, yodeler, yodling