A family of Microsoft word processing software products for creating web, email, and print documents.
If you tick the check box Superscript (or Subscript) in the Find Font dialog and click OK, you can then click Reading Highlight > Highlight All back in the Find an Replace dialog.
Highlighting superscript and subscript at the same time is not possible this way. You'd have to use the Replace tab of the Find and Replace dialog to apply highlighting or other formatting to all superscripted text, then to apply it to all subscripted text.