The best replacement for prism is pyramid.

The best alternatives to prism are rated as following:
★★★★★  pyramid
★★  mef
★  artpop
★  mirror diagonal
★  triangular pyramid
★  roof prism
★  cylinder
★  porro prism
★  contour
★  diffraction grating
★  cube
★  direct tv
★  mirror
★  spss
★  concord
★  mvvm
★  mvvm light
  fluid
  prism
  pyramid shapes
  grating
  rectangular pyramid
  caliburn
  cinch
  directv
  porro
  nroute
  cylinder is the
  roof
  samsung dart
  reflections
  roof prism binoculars

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

Other search terms related to prism and their ratings are:
★★★★★ rainbow
You have in mind a companion for prism and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of prism in all years. Click on graph for more.
prism
pyramid
mef