The best replacement for self defense is assault.

The best alternatives to self defense are rated as following:
★★★★★  assault
★★★★  martial arts
★★★★  fighting
★★★★  murder
★★★  manslaughter
★★★  stand your ground
★★  retaliation
★★  homicide
★★  self defence
★★  death of some salesmen
★  gun control
★  karate
★  excessive force
★  self-defense
★  self defense
★  sport bjj
  stand your ground law
  aggravated assault
  domestic violence
  deadly force
  380
  necessity

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Speaking about self defense, one probably shouldn't forget about gun statistics.

Other search terms related to self defense and their ratings are:
★★★★★ gun statistics
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Google Trends

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self defense
assault
martial arts