The best replacement for rms is peak.

The best alternatives to rms are rated as following:
★★★★★  peak
★★★  average
★★  peak power
★★  watts
★★  pmpo
★★  ra
★★  standard deviation
★★  mean
★  peak voltage
★  peak to peak
★  avg
★  hms
★  rss
★  program
★  mean vamo
  average voltage
  rmz
  max
  peak compression
  rms
  max watts
  ftc
  effective voltage
  ra surface finish
  average power
  mean voltage
  watt
  rmsd
  peak power speakers
  pos
  pep
  max power
  dynamic power
  true rms
  peak vibration
  program watts
  aes
  average current

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Speaking about rms, one probably shouldn't forget about subs.

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



Google Trends

Scale is based on the average worldwide traffic of rms in all years. Click on graph for more.
rms
peak
average