Mac Os Reset keyboard dictionary. Dictionary freaks out.

I've looked in the Community as well as the internet, didn't find the answer.

I've been writing a looooooooot in the last 4 years, using Pages mainly. I've created my custom dictionary, a lot of replacement rules. Somewhere along the way everythings is getting scrambled. Good words are being changed into bad once, bad once don't correct to good, simple, basic words. It came down to situation, where its just irritating and frustrating, where I have to manualy fix so many words.

I'd like to "factory reset" my dictionary but before I do that I want to save my custom words and my replacements rules and "add them" after the reset. Can this be done? And if so, how?