Check spelling in Excel, remember previous check

I doubt this can be solved.
For every workbook, if I was to do a spell check, is there a way to disregard previously checked words?
The list of previous checks would be related to the workbook in question, not the Dictionary provided by Microsoft (which has a similar function).
The check may be done over a number of instances, workbook open/closed, computer shut down and restarted, workbook edited on more than 1 computer.

The code below basically starts from scratch every time.

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You would have to keep a record of the ranges previously checked

The issue with ranges is that rows and columns will be added in between.

But the issue is that any range such as "B4:B11" may be modified with new words.

OK, thanks. Has anything similar been done so I can use as a guide?