The spelling of /p/ is always either <p> or <pp>. The /r/ sound is spelled <r> or <rr>, or sometimes <wr> initially. Since /r/ cannot occur finally, all the contrasts are initial or intervocalic.
The contrast is between a voiceless plosive and a voiced retroflex continuant, well apart in the mouth. It causes no problems.The only mildly taboo word pairings are pee/re and peed/read.
Interesting pairs include:
papaya pariah passion ration
The mean density value is 2.1%. The list makes 183 semantic distinctions, a loading of 49%.
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Credit: John Higgins