The best replacement for treason is sedition.

The best alternatives to treason are rated as following:
★★★★★  sedition
★★★★★  espionage
★★★★★  high treason
★★  stupidity
★★  freedom of speech
★  betrayal
  traitor
  treason
  aiding the enemy
  heresy

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No companions for treason have been suggested so far.
You have in mind a companion for treason and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of treason in all years. Click on graph for more.
treason
sedition
espionage