The best replacement for effort is ability.

The best alternatives to effort are rated as following:
★★★★★  ability
★★★★★  duration
★★★★  efforts
★★★★  performance
★★★★  results
★★★  affort
★★  talent
★★  achievement
★★  afford
★  luck
★  last stitch effort
★  impact
★  group effort
★  reward
★  endeavor
★  e for effort
  conscious effort
  duration microsoft project
  full cost
  reasonable effort
  fiscal capacity
  endeavour
  effort
  elapsed time
  completion

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Speaking about effort, one probably shouldn't forget about talent.

Other search terms related to effort and their ratings are:
★★★★★ talent
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Google Trends

Scale is based on the average worldwide traffic of effort in all years. Click on graph for more.
effort
ability
duration