The best replacement for transparency is opacity.

The best alternatives to transparency are rated as following:
★★★★★  opacity
★★★  privacy
★★★  translucency
★★★  negative film
★★★  secrecy
★★  confidentiality
★★  objectivity
★  anonymity
★  alpha
★  diaphaneity
  openness
  visibility
  cloak
  index transparency
  vellum
  seeing
  accountability
  laser transparency
  alpha transparency

Your alternative for transparency is not listed? Suggest!
Speaking about transparency, one probably shouldn't forget about png.

Other search terms related to transparency and their ratings are:
★★★★★ png
★★★★ jpeg
★★★ inkscape
★★ mspaint
★★ jpg
★ aero
You have in mind a companion for transparency and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of transparency in all years. Click on graph for more.
transparency
opacity
privacy