The spelling of /p/ is always <p> or <pp>. The /ʧ/ sound is normally <ch> or <tch>, though we also see <tu> in suture, torture and vesture, and it occurs in the letter name H.
The contrast is between a plosive and an affricate, both voiceless but well separated in the mouth. There is little risk of confusion.
Interesting pairs include:
The mean density value is 3.4%. The list makes 152 semantic distinctions, a loading of 51%.
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Credit: John Higgins