The word masquerader 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: 25
Highest Scoring Words With Friends™ Play In The Letters masquerader
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Seven Letter Word Alert: (22 words)
demurer, dreamer, eardrum, erasure, marauds, marquee, marques, measure, medusae, murders, readers, readmes, reamers, rearmed, redream, rereads, resumed, resumer, smeared, smearer, squared, squarer