The best replacement for tread is riser.

The best alternatives to tread are rated as following:
★★★★★  riser
★★★★★  thread
★★★  riser first
★★★  hydroedge
★★★  tread
★★★  stair riser
★★  trod
★★  triple tread
★  comfort tread
★  assurance comfort tread
★  tred
  stair nose
  block tread
  tire thread

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tread
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