Illusion and Delusion
Incorrect: The sun appears to go round the earth, but this is a delusion.
Correct : The sun appears to go round the earth, but this is an illusion.
Incorrect: He suffered from the illusion that he was a king.
Correct : He suffered from the delusion that he was a king.
Note: An illusion is something which people might reasonably believe to be true, but is in fact false. A delusion is something which is believed to be true (perhaps by one person only) but is obviously false.
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