The best replacement for millimeter is centimeter.

The best alternatives to millimeter are rated as following:
★★★★★  centimeter
★★★★  inch
★★  meter
★★  micrometer
★★  caliber
★★  millimetre
★  40 caliber
★  centimeter which is bigger
★  backscatter
★  micron
★  decimeter
★  kilometer
★  microliter
★  centimeters
  380
  38 special
  38
  357 magnum
  45 caliber
  mil
  357
  mils

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