The word illegitimates 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: 20
Highest Scoring Words With Friends™ Play In The Letters illegitimates
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Seven Letter Word Alert: (36 words)
aiglets, alleges, alltime, eaglets, elegist, elegits, elitism, elitist, galette, gametes, gamiest, gelates, gestalt, gestate, ileitis, illites, imitate, itemise, itemset, latites, legates, ligates, limelit, mallets, mettles, mileage, militia, millets, mistell, mitiest, sigmate, tallest, tallies, teatime, tellies, tillage