The best replacement for ok is okay.

The best alternatives to ok are rated as following:
★★★★★  okay
★★★  ok
★★  k
★  ror
★  okay grammar
★  apply
★  ko
★  ndsu
★  alright
★  tx
  fl
  fine
  not ok
  ne
  neb
  kk
  greenville tx
  o.k
  krebs ok
  nd state
  muskogee ok

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Speaking about ok, one probably shouldn't forget about prenatal vitamins.

Other search terms related to ok and their ratings are:
★★★★★ prenatal vitamins
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