What is the Root word of supercalifragilisticexpialidocious?

There is no single root word for "supercalifragilisticexpialidocious." It's a nonsense word created by Walt Disney for the movie "Mary Poppins."

It's made up of a combination of seemingly random syllables and sounds that sound impressive and grand. While it doesn't have a real meaning, it's used to express delight, wonder, and excitement.