You may be looking for the word 'misconception' but it depends on the context.
For example
There is a misconception that English is the official language of the United States.
If that word doesn't work for you try looking at a thesaurus (you can find many online) it will show you synonyms for words you already know.
I hope this helped!
16 juin 2021
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Mistake!
16 juin 2021
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