The best replacement for tertiary is secondary.

The best alternatives to tertiary are rated as following:
★★★★★  secondary
★★★★  quaternary structure
★★★  quaternary
★★  ternary
★★  third
★  secondary sources
★  secondary education
★  secondary prevention
★  paleogene
  secondary consumers
  secondary structure
  secondary structures
  quaternary structures

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tertiary
secondary
quaternary structure