The best replacement for delusion is illusion.

The best alternatives to delusion are rated as following:
★★★★★  illusion
★★★★★  hallucination
★★  reality
★  delirium
★  paranoia
★  psychosis
★  disillusion
★  hallucination definition
★  dementia
  obsession
  hallucinations
  kb project
  god is not great
  overvalued idea
  dilusion

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

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



Google Trends

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delusion
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hallucination