The best replacement for percentile is percentage.

The best alternatives to percentile are rated as following:
★★★★★  percentage
★★  percent
★★  percentile rank
★★  quartile
★★  average
★  median
★  quantile
★  confidence interval
★  z score
★  standard deviation
★  rank
★  centile
  iq
  standard score
  score cat
  score
  stanine
  marks cat
  decile
  normal curve
  gmat score
  cumulative percentage
  top percentage

Your alternative for percentile is not listed? Suggest!
Speaking about percentile, one probably shouldn't forget about z score.

Other search terms related to percentile and their ratings are:
★★★★★ z score
★★★ standard deviation and mean
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percentile
percentage
percent