Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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A group of pugs is called a grumble.
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The word "listen" contains the same letters as "silent."
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The word 'mile' is derived from the Latin word for 1,000 - the number of paces it took the average Roman!
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Anuptaphobia is the fear of staying single.
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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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Floccinaucinihilipilification, the declaration of an item being useless, is the longest non-medical term in the English language.
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