The best replacement for indices is indexes.

The best alternatives to indices are rated as following:
★★★★★  indexes
★  powers
  indicadores
  scales
  index
  indicators
  unweighted indices

Your alternative for indices is not listed? Suggest!
Speaking about indices, one probably shouldn't forget about brackets simplifying.

Other search terms related to indices and their ratings are:
★★★★★ brackets simplifying
You have in mind a companion for indices and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of indices in all years. Click on graph for more.
indices
indexes
powers