How to stop autocorrect from changing

How do I get autocorrect to stop changing beyond to behind?

This is a specific autocorrect issue that happens almost every single time I type beyond. I have corrected the system hundreds of times. As behind is essentially the exact opposite of the word in use? It’s both more noticeable and more annoying. It’s the equivalent of typing down and having the system correct it to up.

Any help would be appreciated!