The word martyrises 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: 15
Highest Scoring Words With Friends™ Play In The Letters martyrises
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Seven Letter Word Alert: (27 words)
armrest, arrests, artsier, marries, martyrs, masters, mastery, misseat, misters, raisers, rasters, restirs, retrims, satires, sierras, smarter, smartie, smiters, starers, stayers, strayer, streams, streamy, stymies, tarries, trimers, tsarism