Is it possible to select a word in a note and write a note for that specific word(for example its definition). And when you hover over that word the note will show up.
This would be a great feature.
Well you can already call up the definition of a Word using the global Mac service for doing so (Ctrl-Cmd-D on the hovered word), if that is mainly what you were looking for. As for adding annotations to text in Scapple, no that isn’t a planned feature, nor is there anything like that other than the existing tools available for writing about something else and then linking it to that thing.