The word necropolis 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: 18
Highest Scoring Words With Friends™ Play In The Letters necropolis
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Seven Letter Word Alert: (36 words)
cloners, coiners, console, coolers, copiers, creosol, crispen, cronies, epsilon, erosion, loonier, loonies, loopier, oleosin, operons, orioles, pencils, pincers, pleions, plosion, polices, porcine, precool, princes, proline, reclips, recoils, recoins, respool, scooper, scorpio, snooper, splenic, splicer, spoiler, spooler