The best replacement for conversion is theft.

The best alternatives to conversion are rated as following:
★★★★★  theft
★★★★★  portability
★★★★  recharacterization
★★★★  death pact
★★★  conversion
★★★  somatization
★★★  transformation
★★  death siphon
★★  salvation
★  yield
★  dual conversion
★  migration
★  rollover
★  trespass to chattel
★  regeneration
★  embezzlement
★  ira recharacterization
★  selectivity
★  diversion
★  larceny
★  trespass to chattels
★  conductivity
★  mcg to mg
★  merger
★  euro
★  somatization disorder
  data migration
  commingling
  hipaa
  somatoform
  motorhome
  fahrenheit to celsius
  trespass to personal property
  residence time
  portability life insurance
  extension
  roth recharacterization
  carat
  factitious disorder
  peso
  portability insurance
  units
  intersystem crossing

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Speaking about conversion, one probably shouldn't forget about fire doors.

Other search terms related to conversion and their ratings are:
★★★★★ fire doors
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Google Trends

Scale is based on the average worldwide traffic of conversion in all years. Click on graph for more.
conversion
theft
portability