Adding foreign terms to Word's spell checker, where do you draw the line?

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When spell checking a legal translation in Word, do you ever find it obnoxious to have to keep hitting the "Ignore" or "Ignore all" button? I know I do. This has led me to add some foreign terms and all names, foreign or not to Word's spelling dictionary by pressing alt+a in the spellcheck dialog.

However, I do not add words like Calle, which must be kept in Spanish if it is part of a street address or Colonia or Circunvalación or Polígono or Zacatecas or any number of place names.

This, of course makes the spell checking process more tedious and cumbersome. I could decide to add them and have them infiltrate as "visitors" to the official English realm, but then what if for some reason I was overwriting a document in Spanish and I left some of those words in by accident? This would make the spellchecker less reliable.

I know that there is a custom spellcheck dictionary that I could set up in Word, but I have not taken that step yet. Another possibility would be to use a different word processor and create a spell check scheme to accomodate my needs. A good place to find solutions to this and other Word-related dilemmas is Word Tips.