My spell checker gives me the irrits

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When you start using word it gives you the option of selecting the language you want to use and I chose english with english spelling. However, every time I type something it either auto corrects my spelling to the american version or it identifies it as an error. I am constantly having to add words spelled in the way I prefer, but even then it still either auto corrects or identifies it as a spelling error. I know it's a little thing but it still annoys me.