The best replacement for hormone is neurotransmitter.

The best alternatives to hormone are rated as following:
★★★★★  neurotransmitter
★★★★  enzyme
★★★  steroids
★★  vitamin
★★  testosterone
★★  steroid
★  fsh
★  calcitonin
★  an enzyme
★  hgh
★  pheromone
  testosterone booster
  animal hormone
  adh
  aldosterone
  peptide
  cytokine
  lh
  peptide hormone
  neurohormone
  tsh
  growth factor

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

Other search terms related to hormone and their ratings are:
★★★★★ hormone
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Google Trends

Scale is based on the average worldwide traffic of hormone in all years. Click on graph for more.
hormone
neurotransmitter
enzyme