Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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The word 'mortgage' comes from a French law term that means 'death pledge'.
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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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Floccinaucinihilipilification, the declaration of an item being useless, is the longest non-medical term in the English language.
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Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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The word "impossible" dropped in use by 50% over the course of the 20th century
5
"Stewardesses" is the longest word that is typed with only the left hand.
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