What’s the fear of long words called?

This 36-letter tongue-twister was first used by the Roman poet Horace in the first century BCE to poke fun at writers with an unreasonable love for long words. Fast forward to 2000, and it was American poet Aimee Nezhukumatathil who coined the term as we know it today: Hippopotomonstrosesquippedaliophobia.

It's worth noticing that like aibohphobia (fear of palindromes), this is an amusing wordplay, not a genuine medical condition.