multiple custom spell-check dictionaries with word and powerpoint

I need to use multiple custom spell-check dictionaries with powerpoint, as I
have a list of well over 5,000 words I need to use, and it turns out that
custom dictionaries are only "legal" if they are under 5,000 words,
according to MS Word's help-file listing. Also, it seems that I must do
the "dictionary management" in Word, as there does not seem to be a place to
do this in powerpoint, and the Powerpoint help-file says ....

"To broaden the type of text you can check for spelling, PowerPoint uses
dictionaries of other languages as well as supplemental dictionaries when
installed by other programs in Microsoft Office."

.... so, then it seems I must use Word to set up multiple custom
dictionaries, and powerpoint should follow and use whatever collection of
dictionaries I select for use in Word, as well as the selection of the
"default" custom dictionary file, and will recognize the location of all
these dictionaries as set up in MS Word?

AND HERE IS a new problem. I did the above, and as a test copied one of the
words from one of the new custom dictionaries, then I opened both MS Word
and
Powerpoint and used the word in both. Word saw it as correctly spelled,
but PowerPoint did not! It seems that Word is seeing the new dictionaries,
but PowerPoint isn't! I even put the dictionaries in the same folder as the
"regular" CUSTOM.dic file and then added them using the dialog box in Word,
so they are definitely installed correctly. What to do?

Replied to earlier question in spelling.grammar newsgroup.

Cindy Meister