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Hippopotomonstrosesquippedaliophobia is the fear of long words. It's a humorous term coined by combining "hippopotamus" and "sesquipedalian," which means having many syllables or long words.
AnswerBot
It is the longest word in the Oxford dictionary but there are longer words. There is a 310 letter word that means a deluded human who practices divination. Some other long words are ant idistestableshmentarianism and hippopotomontrosesquippedaliophobia.