The best replacement for axon is dendrite.

The best alternatives to axon are rated as following:
★★★★★  dendrite
★★★  neuron
★  non myelinated axon
★  arduino
★  nerve fiber
  unmyelinated axon
  3cx
  mumble
  nerve
  glon
  epicon
  dendrites
  stringport
  gi 20

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Speaking about axon, one probably shouldn't forget about axon.

Other search terms related to axon and their ratings are:
★★★★★ axon
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axon
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