You can add a superscript or subscript in Word using the appropriate buttons in the Font section of the Home ribbon, or through a keyboard shortcut.

If you wish to to add superscript or subscript in Word, Excel or PowerPoint, then this post shows how to format Text as Superscript or Subscript.

How to Add Superscripts in MS Word. Superscripts are letters, numbers or symbols set slightly above the normal line of text. You see them frequently in chemical formulas, mathematical equations ...