The best replacement for esl is ell.

The best alternatives to esl are rated as following:
★★★★★  ell
★★★★★  efl
★★★  esol
★★  tesol
★★  bilingual
★★  bilingual education
★  special education
★  eld
★  asl
★  esea
★  toefl
★  tefl
★  eal
  special ed
  dual language
  lep
  efl difference
  motion 40
  ld
  nsc
  learning disability
  bilingual classes
  immersion

Your alternative for esl is not listed? Suggest!
Speaking about esl, one probably shouldn't forget about jennifer.

Other search terms related to esl and their ratings are:
★★★★★ jennifer
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esl
ell
efl