The best replacement for potentiometer is rheostat.

The best alternatives to potentiometer are rated as following:
★★★★★  rheostat
★★★  variable resistor
★★  encoder
★★  voltmeter
★  trimmer
★  hall effect sensor
  stepped attenuator
  lvdt
  attenuator
  resistor
  trimpot
  linear potentiometer

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potentiometer
rheostat
variable resistor