The word magistrates 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: 16
Highest Scoring Words With Friends™ Plays In The Letters magistrates
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Seven Letter Word Alert: (53 words)
agatise, agitate, aigrets, airmass, amritas, artiest, artists, atresia, attires, eartags, gaiters, gamiest, gassier, imagers, iratest, margate, massage, masters, matters, metrist, migrate, mirages, misseat, misters, ragtime, regatta, sagiest, satiate, satires, searats, seastar, sigmate, sitters, smartie, smatter, smiters, stagers, stagier, staters, statism, stigmas, straits, stratas, streams, striate, targets, tasters, tastier, teargas, tigress, triages, tsarism, tsarist