The word pyromaniacs 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: 23
Highest Scoring Words With Friends™ Play In The Letters pyromaniacs
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Seven Letter Word Alert: (23 words)
acronym, animacy, apronym, campion, company, crampon, crayons, crimson, ironyms, maniacs, marconi, marinas, masonic, masonry, microns, miscopy, narcoma, oarsman, paronym, primacy, prosaic, sarcoma, scrimpy