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sh (ʃ) vs dj (ʒ) vs ch (tʃ) vs j (dʒ)



Introduction


Looking at the list, I think "sh (/ʃ/)" "ch (/tʃ/)" and "j (/dʒ/)" are clearly distinct sounds.    dj (/ʒ/) is different from other sound, but substitution with "sh (/ʃ/)" wouldn't attract much attention. 

Plus, in some word like "version", both sounds are correct.

See also: sh (ʃ) vs dj (ʒ)

Voiced vs Voiceless

  • /ʒ/ is a voiced counterpart of the voiceless sound /ʃ/.
  • /dʒ/ is a voiced counterpart of the voiceless sound /tʃ/.

Suffix vs sounds


Word ending "-tion", "-sion" can be fall into either "sh (/ʃ/) or dj (/ʒ/) or ch (/tʃ/)".  

Mostly

  • -tion is "/ʃ/".
  • -sion is "/tʃ/" with some exception pronounce "/ʒ/"

Comparison Table


 sh (ʃ) dj (ʒ) ch (tʃ)j (dʒ)
 
  • measure (/m'eʒəʳ/)
  • vision (/v'ɪʒən/)
  • beige (/b'eɪʒ/)
  • exposure (/ɪksp'oʊʒəʳ/)
  • closure (/kl'oʊʒəʳ/)
  • pleasure (/pl'eʒəʳ/)
  • treasure (/tr'eʒəʳ/)
  • leisure (/l'eʒəʳ/   /l'iːʒəʳ/ US)
  • enclosure (/ɪnkl'oʊʒəʳ/)
  • disclosure (/dɪskl'oʊʒəʳ/)
  • illusion (/ɪl'uːʒən/)
  • decision (/dɪs'ɪʒən/)
  • derision (/dɪr'ɪʒən/)
  • delusion (/dɪl'uːʒən/)
  • fusion (/fj'uːʒən/)
  • cohesion (/koʊh'iːʒən/)
  • version (/v'ɜːʳʃən, v'ɜːʳʒən/)
  • aversion (/əv'ɜːʳʃən/  /əv'ɜːʳʒən/ US)
  • diversion (/daɪv'ɜːʳʃən/   /dɪv'ɜːrʒən/ US)
 
  •  smudge (/sm'ʌdʒ/)


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