The best replacement for amine is amide.

The best alternatives to amine are rated as following:
★★★★★  amide
★★★★  amino
★★★  imine
★★★  ester
★★  amide more basic
★★  amino group
★  amino acid
★  alcohol higher boiling point
★  ammonium
★  alcohol boiling point
★  alcohol nucleophilicity
★  amine
★  2-4d ester
★  amide more polar
★  ammine
  triclopyr ester
  pantaleo
  secondary amine
  esther
  2,4 d ester
  rich amine
  peptide

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

Other search terms related to amine and their ratings are:
★★★★★ aldehyde
★★★★★ carboxylic acid
★★★ acid chloride
★★ hcl and h2o
★★ nitrous acid
★★ ester
★★ benzene ring
★★ alkyl halide
★★ acetic anhydride
★ bromine water
★ acyl chloride
★ anhydride
★ aldehyde mechanism
carbonyl
an ester
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Google Trends

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amine
amide
amino