You can embed a PowerPoint slide in a Word document and then,because it is embedded,use PowerPoint tools within Word to add text to the slide and apply formatting.

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When a PowerPoint slide is embedded in a Word document, it becomes an object that can be manipulated within Word. This allows you to use PowerPoint tools to add text and formatting to the slide, even though you are working in Word.

You Can Embed a PowerPoint Slide in a Word Document