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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Stressed is Desserts spelled backwards.
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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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The word "impossible" dropped in use by 50% over the course of the 20th century
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