The word mongrelized 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: 28
Highest Scoring Words With Friends™ Play In The Letters mongrelized
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Seven Letter Word Alert: (36 words)
deeming, deleing, demerol, demoing, eloined, enolize, eroding, gloried, godlier, gremlin, groined, ignored, leering, lemoned, lozenge, melding, mendigo, mingled, mingler, modeler, moldier, molding, mongrel, negroid, redline, redoing, reeling, regimen, reigned, relined, relodge, remined, remodel, reoiled, rezoned, zeroing