The best replacement for sight is site.

The best alternatives to sight are rated as following:
★★★★★  site
★★★  sound
★★  vision
★★  blindness
★  hearing
★  taste
★  red dot
★  scope
★  red dot sight
  holographic sight
  smell
  blindness oedipus
  site when to use
  might
  holographic
  usance letter of credit
  ant might
  touch
  reflex sight
  bronson
  seeing
  laser sight
  disorder
  psi ops
  rifle sight
  usance lc
  eotech
  t t
  fixed pin

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Speaking about sight, one probably shouldn't forget about seeing.

Other search terms related to sight and their ratings are:
★★★★★ seeing
★★ tactical light
★ windage
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Google Trends

Scale is based on the average worldwide traffic of sight in all years. Click on graph for more.
sight
site
sound