How To Create Custom Dictionaries in Microsoft Office
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The basics are explained at this page.
To add to this dictionary long lists of words you know you are going to use, then find the Custom.dic file (it is a plain text file; the path can be found by clicking on Tools->Options->Spelling & Grammar and then clicking on the Custom Dictionaries button) and paste into it each word you want to use (one per line). Save it as text and you're done!
