The best replacement for retardant is flame resistant.

The best alternatives to retardant are rated as following:
★★★★★  flame resistant
★★★★★  fire resistant
★★★  fire proof
★★★  fire retardant
★★  fire rated
★★  non flame retardant
★  flame retardant
★  flame resistance
★  fire resistance
  retardant
  fireproof

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Google Trends

Scale is based on the average worldwide traffic of retardant in all years. Click on graph for more.
retardant
flame resistant
fire resistant