The best replacement for combustion is after effects.

The best alternatives to combustion are rated as following:
★★★★★  after effects
★★★★  oxidation
★★★  burning
★★★  vaporization
★★★  shake
★★  explosion
★★  great combustion
★★  decomposition reaction
★★  respiration
★★  pyrolysis
★  gasification
★  synthesis
★  vaping
★  cellular respiration
★  incomplete combustion
★  incineration
★  decomposition
★  fireball dark souls
★  vapor
★  fire orb
★  detonation
★  toxik
★  internal combustion
★  electric engine
★  pneumatic spud gun
  digital fusion
  metabolism
  direct vent
  external combustion
  incomplete
  fuel cell
  black flame
  after effect
  steam engine

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

Other search terms related to combustion and their ratings are:
★★★★★ electricity
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Google Trends

Scale is based on the average worldwide traffic of combustion in all years. Click on graph for more.
combustion
after effects
oxidation