The best replacement for tesol is tefl.

The best alternatives to tesol are rated as following:
★★★★★  tefl
★★★  tesl
★★★  tefl certificate
★★★  esl
★★  celta
★  toefl
★  applied linguistics
★  tefl better
★  tefl difference
★  tefl certification
  esol
  cambridge celta
  tesols
  tefl which is better
  tefl courses
  celta certificate

Your alternative for tesol is not listed? Suggest!
Speaking about tesol, one probably shouldn't forget about applied linguistics.

Other search terms related to tesol and their ratings are:
★★★★★ applied linguistics
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Google Trends

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