I cannot get spellcheck to stop changing HSA to HAS in WORD 2007

I have one user that needs to type the letters HSA in Word documents very often. The spellchecker, that she normally uses, consistantly changes this th HAS. I have tried add it to the WORD LIST under PROOFING but WORD still does not recognize HSA as a legit word. I am sure I am missing a step. Could someone help me out?
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Go to the Office Button, then to the program’s Options button. Once in the program options, select Proofing as the options category, and you will see the button for Autocorrect. Just type the exceptions that you do not want the programs to change. You can also  check on the list for the word HSA and delete it.

More info about this: http://www.dummies.com/how-to/content/how-to-use-and-customize-autocorrect-in-word-2007.html

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