The best replacement for neuron is nerve.

The best alternatives to neuron are rated as following:
★★★★★  nerve
★★★  lower motor neuron
★★  glia
★★  nerve cell
★★  axon
★★  neuroglia
★  neurone
★  upper motor neuron
★  universe
★  sensory neuron
★  nerve fiber
★  ganglion
  nerve cells
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  glial cells
  lower
  alpha motor neuron
  hartmann
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  motor neuron
  lower neuron
  afferent neuron

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Speaking about neuron, one probably shouldn't forget about synapse.

Other search terms related to neuron and their ratings are:
★★★★★ synapse
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