I was working on a new book recently and bolded a lot of important terms. I then remembered that I actually had a style created for key words and should have been using the style rather than simply using bold; I convert the Word document into a number of different formats and styles, rather than simple bold, works a lot better for the conversion process.
A 200 page book was going to be somewhat long-winded to go through and update, but then I remembered seeing some additional options in the Find and Replace window a while ago.
Ctrl+H and then click the More >> button. Click the Format button and select Font…: