Finnish comedian Ismo Leikola makes a compelling case that "ass" is the most complicated word in the English language.
He also shares the most important word In Finnish (spoilers: it's "noni" and variants).
https://www.youtube.com/watch?v=HtAd78dWUlA
• Ismo: Ass Is The Most Complicated Word In The English Language (YouTube / Team Coco)