Are there other possible non-words that you know of?

A question was recently asked if “unserious” is a real word. It got me wondering about other words I have heard over the years. One was “irregardless”. It is technically a word, but is sort of an uncouth way of saying “regardless”. Another was “updations” as in “Our manuals get updations all the time” It is not a word but flows so smoothly you kinda have to think about it.

Also if you have words that you have heard but the pronunciation was not what you thought it was, those are welcome as well.