The best replacement for ow is ouch.

The best alternatives to ow are rated as following:
★★★★★  ouch
★★★★  ou
★★★  ou words
★  edisto
  oy
  ow
  odsp

Your alternative for ow is not listed? Suggest!
Speaking about ow, one probably shouldn't forget about long o sound.

Other search terms related to ow and their ratings are:
★★★★★ long o sound
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ow
ouch
ou