The best replacement for opening is passageway.

The best alternatives to opening are rated as following:
★★★★★  passageway
★★★★  grand opening
★★★  openning
★★★  gap
★★  london opening
★★  masonry opening
★★  door size
★★  window size
★★  eye opening
★  switchblade
★  beijing opening
★  open house
★  e4
★  hole
★  opening
  d4
  edelbrock neck opening
  hard opening
  london olympic opening

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Speaking about opening, one probably shouldn't forget about outlook express.

Other search terms related to opening and their ratings are:
★★★★★ outlook express
★★★ no experience
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Google Trends

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opening
passageway
grand opening