The best replacement for ohs is permian.

The best alternatives to ohs are rated as following:
★★★★★  permian
★★★★  phs
★★★  osa
★★  whs
  mojo
  osh

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Speaking about ohs, one probably shouldn't forget about osa.

Other search terms related to ohs and their ratings are:
★★★★★ osa
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Google Trends

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ohs
permian
phs