The best replacement for reliability is validity.

The best alternatives to reliability are rated as following:
★★★★★  validity
★★★★  availability
★★★  relevance
★★  accuracy
★  quality
★  credibility
★  durability
★  validity more important
★  failure rate
★  precision
★  validity assessment
★  consistency
  dependability
  validity psychology
  validity sociology
  stability
  confidence
  agreement
  integrity
  validity first
  mtbf
  silverado
  weak validity
  validity measurement
  accountability
  resilience
  variability
  maintainability
  hardware reliability
  confidence level
  factor analysis
  honda
  robustness

Your alternative for reliability is not listed? Suggest!
Speaking about reliability, one probably shouldn't forget about validity.

Other search terms related to reliability and their ratings are:
★★★★★ validity
★★★ inter-rater reliability
★★ 95% confidence
★ inter rater reliability
no validity
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Google Trends

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reliability
validity
availability