The best replacement for thriller is horror.

The best alternatives to thriller are rated as following:
★★★★★  horror
★★★★  mystery
★★★  bad
★★★  suspense
★★  off the wall
★★  purple rain
★  drama
★  horror movies
★  horror difference
★  eagles greatest hits
★  smooth criminal
  billie jean
  heads will roll
  beat it
  off wall
  dark side of the moon
  prince purple rain
  thriller

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Other search terms related to thriller and their ratings are:
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Google Trends

Scale is based on the average worldwide traffic of thriller in all years. Click on graph for more.
thriller
horror
mystery