The best replacement for proficiency is fluency.

The best alternatives to proficiency are rated as following:
★★★★★  fluency
★★★★★  competency
★★★★  efficiency
★★★  expertise
★★★  mastery
★★  proficient
★  achievement
★  exploration
★  currency
  native
  competence
  ielts
  toefl
  tactical knife
  working knowledge

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Google Trends

Scale is based on the average worldwide traffic of proficiency in all years. Click on graph for more.
proficiency
fluency
competency