The best replacement for functional testing is unit testing.

The best alternatives to functional testing are rated as following:
★★★★★  unit testing
★★★★★  integration testing
★★★★  regression testing
★★★★  system testing
★★★★  performance testing
★★★  structural testing
★★★  acceptance testing
★★  blackbox testing
★★  usability testing
★★  non functional testing
★  end to end testing
★  manual testing
  technical testing
  user acceptance testing
  security testing
  uat

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Google Trends

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functional testing
unit testing
integration testing