Word is a WYSIWYG editor. We don’t talk about it much these days because it’s just how things are done, but it took a long time for the industry to come up with a way to display text on screen with rich formatting and have it come out the same way in print. There was a lot of buzz around it in the late 80s and early 90s.
Word solves a completely different problem than an IDE. Notepad is a raw, minimal tool that could be built on for either WYSIWYG or an IDE.