The word mongrelised 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: 19
Highest Scoring Words With Friends™ Play In The Letters mongrelised
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Seven Letter Word Alert: (95 words)
deeming, degerms, deleing, delimes, demerol, demoing, deniers, denoise, deslime, elogies, eloigns, eloined, endorse, eroding, gelders, genders, genomes, gilders, girdles, girnels, gliders, gloried, glories, godlier, goldens, greisen, gremlin, groined, ignored, ignores, indoles, indorse, isomere, ledgers, leering, legends, legions, lemoned, lenders, lingers, lingoes, linseed, lodgers, melding, menders, mendigo, milords, minders, mingled, mingler, mingles, misdoer, misdone, modeler, moderns, molders, moldier, molding, mongers, mongrel, negroes, negroid, nimrods, oilseed, redline, redoing, reeling, regilds, regimen, regimes, regions, reigned, relined, relines, relodge, remends, remiges, reminds, remined, remines, remodel, remolds, reoiled, resoled, rosined, sedgier, seeding, seeming, semilog, singled, slender, slinger, smidgen, smolder, soldier