I don't know how to check the proofing language, but at the bottom of the document it says "English (United Kingdom)". Actually I am using AutoCorrect to save typing. I type in some Korean abbreviation and it corrects to the word I want. But the problem is sometimes instead of producing the word I want as AutoCorrect should, it changes to some English string. The Word must think it should be an English word, but this is what I am trying to stop.