The best replacement for converter is adapter.

The best alternatives to converter are rated as following:
★★★★★  adapter
★★★★★  inverter
★★★★  transformer
★★  convertor
★  transmission
★  rectifier
★  clutch
★  remote
★  inverter rv
★  adapter difference
★  muffler
★  adapter plug
★  adaptor
★  regulator
★  o2 sensor
  cartridge
  stall converter
  resonator
  centrifugal clutch
  vfd
  adapter italy
  dr divx
  straight pipe
  torque converter
  no lockup converter
  audio interface
  handbrake
  oxygen sensor
  converter
  cablecard
  platespin
  frequency inverter

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

Other search terms related to converter and their ratings are:
★★★★★ binding
★ multibinding
★ straight pipe
You have in mind a companion for converter and it is not yet here? Propose!



Google Trends

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converter
adapter
inverter