The best replacement for ka is o.

The best alternatives to ka are rated as following:
★★★★★  o
★★★★  mystere
★★★  sr
★★★  pka
★★★  kb
★★  zumanity
★★  zarkana
★  le reve
★  top thrill dragster
★  ku
★  ba
★  kd
  keq
  la reve
  blue man group
  beatles love
  kc
  absinthe
  ksp
  sr20
  o cirque
  corsa
  clio
  ph

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

Other search terms related to ka and their ratings are:
★★★★★ ph
pka
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Google Trends

Scale is based on the average worldwide traffic of ka in all years. Click on graph for more.
ka
o
mystere