Sorry, should have kept an eye on this - the issue with the font is the only reason I didn't mentions Auto Correct.
Another complication is that only part of the cell is to be formatted, so VBA is the only solution.
Open the VBA editor (Alt-F11), double click on the worksheet this is to be used on in the Project Explorer (Ctrl-R if not visible) and paste. I'm assuming there's no existing code so replace anything in the code window with the above. Note the file will have to be saved as an XLSM file (Use Save As and change the file type in the drop down below the directory listing). and you will be prompted to enable macros when you load the file unless it is placed in a Trusted Location.
For simplicity, this just replaces 1 occurrence of a term per cell...
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