Word lets you search for text in your document (instead of you spending hours finding it in a 1000-page document for example.)
To find text, go to the Home tab > Editing group > Find button
to open the Navigation Pane on the screen's left side:
The Navigation Pane on the left side of the screen. Miriam Briskman, CC BY-NC 4.0.
Click in the search box and type the text you are looking for to let Word find all the instances of that text in the document!