Pneumonoultramicroscopicsilicovolcanoconiosis is 45 letters long... and The phobia is 36 letters long, so the lung disease is longer.
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Hippopotomonstrosesquippedaliophobia has only one word. It is one word, but it has 36 letters. P.S. It's the fear of long words.
45
45
hippopotomonstrosesquippedaliophobia honorificabilitudinitatibus
Pneumonoultramicroscopicsilicovolcanoconiosis (also happens to be the longest word in the English language)