The best replacement for fluent is proficient.

The best alternatives to fluent are rated as following:
★★★★★  proficient
★★★★  conversational
★★★  cfx
★★★  intermediate
★★  native
★★  fluid
★  business proficient
★  fluently
★  openfoam
★  bilingual
★  proficient in spanish
  comsol
  expert
  advanced
  native language
  star ccm+
  native speaker
  fluency
  polite
  proficient language

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fluent
proficient
conversational