The best replacement for ambush is mutilate.

The best alternatives to ambush are rated as following:
★★★★★  mutilate
★★★★  backstab
★★  garrote
★★  cheap shot
★  ruler
★  lotus fan
★  black thunder
★  fearless
★  rewers riposte
★  noisy boy
★  attack cuddeback
★  invasion
  cheapshot
  midas
  2010 blastoff trap
  six shooter
  ravage
  bull real steel
  mutilate assassination
  hasty ambush
  str8 rippin
  cheap shot wow
  solo skiff

Your alternative for ambush is not listed? Suggest!
Speaking about ambush, one probably shouldn't forget about mutilate.

Other search terms related to ambush and their ratings are:
★★★★★ mutilate
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Google Trends

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ambush
mutilate
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