Hello, I've seen this before in a wordpress application. Sounds like something that could be useful. When the text is hovered, it opens into a window and it says something related to the text. I searched in the Plugin-Store section and found a few examples, but one seems close to what I mentioned, and its version is very old. I think this feature can be fine if added.
VieCode Lexicon / Article system (WoltLab Suite)
The VieCode Lexicon is a powerfull wiki for your community!