The word illegitimacies 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 illegitimacies
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Seven Letter Word Alert: (49 words)
aiglets, alleges, alltime, cagiest, calmest, castile, cellist, ciliate, climate, eaglets, elastic, elegaic, elegiac, elegist, elegits, elicits, elitism, emetics, gametes, gametic, gamiest, gelates, ileitis, illicit, illites, illitic, italics, itemise, laciest, laicise, legates, ligates, limelit, malices, mallets, metical, micella, micelle, mileage, militia, millets, miscall, miscite, mistell, sigmate, silicle, tallies, tellies, tillage