Hippopotomonstrosesquippedaliophobia is the fear of long words.
sesquippedaliophobia is the real one; to exaggerate and make it more fearful, words Hippo(Hippopotamus) and Monstro(Monster) have been added.
sesquipedalian – Characterized by long words; long-winded.
Phobia – fear of something
Who cares, we never have time to read what is after ‘hippo’ and before ‘phobia’ : )