Floccinaucinihilipilification, the declaration of an item being useless, is the longest non-medical term in the English language.
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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A group of ferrets is called a business.
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The technical term for a cat’s hairball is a “bezoar.”
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