Anatidaephobia – The first pert is derived from the Greek word “anatidae”, meaning ducks, geese or swans. The last part is phobia meaning an irrational or obsessive fear or anxiety.
Hippopotomonstrosesquipedaliophobia – Also spelt hippopotomonstrosesquippedaliophobia (common misspelling, perhaps on purpose, to make the word even longer). The first section is a truncated, misspelled form of hippopotamus, intended to exaggerate the length of the word itself and the idea of the size of the words being feared. The second is monstrum, meaning monster or evil (that evokes both fear and wonder). The next is sesquipedalian (literally “a foot and a half long”), meaning a long word or a person who uses long words. The last phobia, an irrational or obsessive fear or anxiety.