The best replacement for periphery is core.

The best alternatives to periphery are rated as following:
★★★★★  core
★★★★  peripheral
★★★★  tesseract
★★★  perimeter
★★★  fovea
★★★  meshuggah
★★  center
★  animals as leaders
★  semi periphery
★  protest the hero
  centre

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Google Trends

Scale is based on the average worldwide traffic of periphery in all years. Click on graph for more.
periphery
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