The best replacement for volatility is standard deviation.

The best alternatives to volatility are rated as following:
★★★★★  standard deviation
★★★★★  risk
★★★★  variance
★★★★  beta
★★★  historical volatility
★★  vapor pressure
★★  implied volatility
★★  boiling point
★  option price
★  momentum
★  var
★  value at risk
  tracking error
  variability
  theoretical volatility
  actual volatility
  realized volatility
  equity volatility
  historical
  high vega
  garch
  stock price
  vega

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Speaking about volatility, one probably shouldn't forget about options.

Other search terms related to volatility and their ratings are:
★★★★★ options
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volatility
standard deviation
risk