Most of those are British English spellings, which are different for certain words in American English.
Just change the dictionary employed to British English.
I wasn't asking for help. I was pointing out the lack of logic in our spelling system and the inflexibility of a system (spell checking) that tells you that one spelling or the other is wrong when both are correct.
In fact, because of wrestling with my "problem" for a very long time, I've become very good at explaining things that other people don't even understand.
From time to time you will see some extremely ignorant know-it-all in this forum correct the spelling of another poster who is using perfectly correct British English. Most people just go by rules they were taught in school and have no idea where the rules came from, and when they can be wisely ignored.
It's not just spelling:
A is different to B: UK and other places
A is different than B: US
A is different from B: standard and best to use in writing just to avoid controversy
There are hundreds of things like that, and most people do not have a clue they exist.