With Track changes on, I select the first letter of a word and …

• type another letter: result, whole word replaced
• delete the selected letter and type another one: result, first letter replaced

Hope this helps!

Mind you, consider your users and editors: it's not going to be easy to read a text where you have lots of highlighted single-letter corrections.

But that will still leave you with a whole word replaced via the initial change; and the second one won't be recorded as a discrete change at all unless you save the document between edits.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

Thanks to all... I got it..

'First rule of management – check all assumptions' <vbg>
When I presented the two approaches in an unordered list, I assumed this would be read as "follow either step for its own result"; I should have given a better lead-in. So, assuming OP deletes the initial letter and then types in a replacement :-} that would that be tracked/saved, wouldn't it?

That would be tracked as two separate changes, each accounting for a single character. I don't know that that's an improvement (let the OP decide) as the procedure is more convoluted to implement and leaves you with two changes to accept/reject instead of one.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]