Is there a way in Open Office to manually delete items from the spell check dictionaries?
What I'm looking for is a feature that existed in the old DOS WordPerfect spell check and that seems to have disappeared in modern spell checks like those of OpenOffice and MS Word. I need it for a Dutch spell check, but let me give an English example:

I often type then instead of than and vice versa. The spell check doesn't notice this. Most grammar checks that I've seen are nowhere near sophisticated enough to determine this in every case.

In WordPerfect 5.1, I could just delete then and than from the "correctly spelled words list", and from then on, the spell check would stop at every instance of then and than. Of course, often it would be spelled right. But this provided an extra alert, a way to automatically double check every then and than.

Of course, you could just perform a search for then or than. But the examples (in Dutch) that I'm thinking of, are too numerous to start searching for. Easier to include them in the spell check routine.

By excluding them from the "correctly spelled words" list, or by adding them to a "stop at ell instances of these words to double-check if they're spelled correctly".
But that would require a new spell check feature.

Incidentally, Open Office has a feature like this: you add a dictionary with "exceptions". It doesn't work perfectly, but at least it works for the inline spell check. For a description see http://user.services.openoffice.org/...hp?f=7&t=32056
Does MS Office (2003 or a later version) have a similar feature?