The word masqueraders 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: 26
Highest Scoring Words With Friends™ Play In The Letters masqueraders
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Seven Letter Word Alert: (37 words)
amassed, assumed, assumer, assured, demurer, dreamer, dresser, eardrum, erasers, erasure, marauds, marquee, marques, masques, masseur, measure, medusae, medusas, murders, quasars, readers, readmes, reamers, rearmed, redream, redress, rereads, resumed, resumer, resumes, seamers, smeared, smearer, squared, squarer, squares, ureases