The best replacement for implied volatility is historical volatility.

The best alternatives to implied volatility are rated as following:
★★★★★  historical volatility
★★★★  historical
★★★★  realized volatility
★★★  actual volatility
★★★  vega
★★  option price
★  volatility
★  realised volatility
★  forward volatility
★  garch
★  theoretical volatility
  historic volatility
  high vega

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

Other search terms related to implied volatility and their ratings are:
★★★★★ options
★★ stock options
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