The best replacement for codon is anticodon.

The best alternatives to codon are rated as following:
★★★★★  anticodon
★  triplet
★  gene
★  nucleotide
★  amino acid
★  codon
  promoter
  anti codon
  exon
  amino acids

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

Other search terms related to codon and their ratings are:
★★★★★ amino acids
★★★★★ sequence __
★★★★★ anticodon
★ corresponding amino acid
★ proper amino acid
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