The word sadomasochist 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: 22
Highest Scoring Words With Friends™ Plays In The Letters sadomasochist
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Seven Letter Word Alert: (28 words)
atomics, cahoots, chamois, chassis, coadmit, diatoms, domatia, domatic, dotcoms, mascots, mastoid, miscast, mosaics, moschid, osmosis, osmotic, sadisms, sadists, scatoma, schisms, schists, scotoma, sitcoms, smooths, sodomic, somatic, stomach, toadish