The /ʃ/ sound is spelled with <sh> or <ch>. The /n/ sound is spelled with <n>, <nn> or <gn> in gnaw.
This is a contrast between a voiceless fricative and a voiced nasal continuant, both in the alveolar region of the mpouth. It is not a problem.
Taboo word pairs include shag/nag and shit/knit.
The contrast occurs in the common collocation "naming and shaming" applied to newspaper exposure of wrongdoing or inefficiency. Other interesting pairs include:
The mean density value is 0.9%. The list makes 97 semantic distinctions, a loading of 60%.
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Credit: John Higgins