What is the longest word that have any vowels?

This is a tricky question! It depends on what you consider a "word".

* If we're talking about official dictionary words, then the longest word with vowels is pneumonoultramicroscopicsilicovolcanoconiosis, which is a lung disease caused by inhaling very fine silica dust. It has 45 letters!

* If we're talking about any word, then the longest word in the English language is "floccinaucinihilipilification", meaning "the act of estimating something as worthless." However, it only has 29 letters.

Let me know if you were thinking of a specific kind of word or if you have another question!