The best replacement for uncertainty is risk.

The best alternatives to uncertainty are rated as following:
★★★★★  risk
★★★★★  error
★★★  accuracy
★★  variability
★  precision
★  standard deviation
★  ambiguity
★  tolerance
★  certainty
★  doubt
★  standard error
★  percent error
  randomness
  risk project management
  uncertainty
  relative uncertainty
  repeatability
  absolute uncertainty
  implied demand uncertainty

Your alternative for uncertainty is not listed? Suggest!
Speaking about uncertainty, one probably shouldn't forget about decision making.

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



Google Trends

Scale is based on the average worldwide traffic of uncertainty in all years. Click on graph for more.
uncertainty
risk
error