The best replacement for sign language is spoken language.

The best alternatives to sign language are rated as following:
★★★★★  spoken language
★★★  signed english
★★★  pecs
★★★  oralism
★★  lip reading
★  signed language
★  cochlear implant
★  asl
★  signing exact english
★  cued speech
  oral communication
  cochlear implants
  oral language
  makaton
  sign language
  british sign language
  exact signed english
  american sign language
  sign
  picture exchange system
  english sign language

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Speaking about sign language, one probably shouldn't forget about mr tumble.

Other search terms related to sign language and their ratings are:
★★★★★ mr tumble
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sign language
spoken language
signed english