The best replacement for an is a.

The best alternatives to an are rated as following:
★★★★★  a
★★★  before h
★  annee
★  before m
★  before acronym
★  npt
★  jic
★  and
★  auf
★  before unique
  before x
  historical
  jic fittings
  année
  before hour
  before a vowel
  grammar rules
  an

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Speaking about an, one probably shouldn't forget about h words.

Other search terms related to an and their ratings are:
★★★★★ h words
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an
a
before h