word is a reference to Microsoft Word. Notepad++ is not a word processor!
There is, however, an old HTML editor of the 1990s: Arachnophilia. I still use it, as it adds tags for me (e.g. select text, then press Ctrl+I to emphasize). I copy-and-paste from Word, for example, to Arachnophilia: the formatting is preserved. Then, when I see bold text, I simply select the text in Arachnophilia and press Ctrl+B, etc.
Maybe Claudia can write such a useful plug-in.
“Plug it in, plug it in!” is a popular ad for air fresheners on American TV.
Peace be with you and this community!