Commonly Mispronounced facts

While investigating facts about Commonly Mispronounced Words and Commonly Mispronounced English Words, I found out little known, but curios details like:

"Coup de grâce" is commonly mispronounced. Because it is a French phrase, it should actually be pronounced using the soft c sound at the end.

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What words are commonly mispronounced?

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what are the most commonly mispronounced words?