The best replacement for supination is pronation.

The best alternatives to supination are rated as following:
★★★★★  pronation
★★★★  pronation foot
★★★  pronation arm
★★★  inversion
★  pronation running
★  neutral pronation
★  overpronation
★  inversion eversion
★  underpronation
★  pronation hand
★  pronation forearm
  eversion

Your alternative for supination is not listed? Suggest!
Speaking about supination, one probably shouldn't forget about flat feet.

Other search terms related to supination and their ratings are:
★★★★★ flat feet
★★ pronation
★★ flat foot
★ low arch
★ elbow flexion
★ low arches
You have in mind a companion for supination and it is not yet here? Propose!



Google Trends

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supination
pronation
pronation foot