is it possible to make changes to the default dictionary

I have a question about the dictionary.
is it possible to make changes to the default dictionary and not to my personal wordlist?
I have some words marked in my story that I don’t want the autocorrect to change, but it keeps changing them, and I’m tired of changing them manually every time. How do I get the auto correct to let these marked words be without disabling it completely.
Thanks.

Check section 15.2.3 (Spell Checking) in the 1.9 manual.