I always forget refactoring, as in code refactoring, and fiber.
I was going to answer this but I can’t remember.
I think writers and readers both stumble over them. I avoid both altogether these days.
Everyone’s names.
The phrase “Baader-Meinhof effect”
I love pointing out examples of it but always forget the name, leading to an awkward moment when I try to explain it
For the people who hadn’t heard of it (like me): https://en.m.wikipedia.org/wiki/Frequency_illusion
I have ADHD, so pretty much every word when I need it most.