What happened to superscript???

The keyboard shortcuts in Word 16.84 (Office 2021 for Mac) on macOS Sonoma 14.4.1:

⇧⌘+ superscript

⇧⌘- subscript

To reverse the effect, issue the same keyboard shortcut again. These shortcuts are not listed in Microsoft's Official Keyboard Shortcuts for MS Word on Mac for Microsoft 365 or Office 2021 for Mac.

Alternatively, one can select Home on the Word menu and the symbolic subscript and superscript buttons are located there beneath the Font and Font size selection.

FWIW in LibreOffice superscript is Shift-Command-P and subscript is Shift-Command-B. Doesn't Word display those shortcuts in its Menus?

Select the text or number that you want. For superscript, press Ctrl, Shift, and the Plus sign (+) at the same time. For subscript, press Ctrl and the Equal sign (=) at the same time.

https://support.microsoft.com/en-us/office/format-text-as-superscript-or-subscript-in-word-507cdffd-8169-4872-96ec-909ea5888dc6#:~:text=Select%20the%20text%20or%20number%20that%20you%20want.,(%3D)%20at%20the%20same%20time.

For future problems with Word, you can also use the forum devoted to it

https://answers.microsoft.com/en-us/msoffice/forum/msoffice_word-msoffice_unknown-mso_OPMac?sort=LastReplyDate&dir=Desc&tab=All&status=all&mod=&modAge=&advFil=&postedAfter=&postedBefore=&threadType=all&isFilterExpanded=true&page=1

You are welcome. You have no monopoly on fog though… 😎