When you are running a search in Word, you can use the navigation pane to help you see at a glance which sections of your document the search terms appear in. This can be really useful once your document starts to get long. You can quickly jump to the section you are interested in by clicking on the section heading in the navigation pane.
The navigation pane appears on the left of your screen in Word. For information on how to turn it on and use it see here https://seehowtodo.wordpress.com/2014/04/19/using-the-navigation-pane-in-word/
As you see in the screenshot below, the search term is highlighted within the text of the document, but also the headings of each section the search term appears in are highlighted in the navigation pane.