An email came through my inbox recently wanting to know how to get synonyms working in OneNote. The author was used to this being on the context menu from Word and wanted to know how to get the same functionality going in OneNote.
There are at least three ways to get to the thesaurus. They all amount to opening the Research pane which has synonyms from a thesaurus (the default), links to Encarta, company profiles and other services. So one way to get to the Research tools is via the Ribbon - Click Review | Research. The Research pane will open along the right.
You can also get to this via the context menu – this is useful if you keep the ribbon minimized. It's invoked via the "Look Up" command:
A third way would be to use SHIFT+F7 as a keyboard shortcut. This is what I do since my hands are usually still in position on the keyboard after typing. For me, this simply is easiest to invoke.
Bonus tip - F6 moves focus over to the research pane from the keyboard.
I hope this helps you out!
Questions, comments, concerns and criticisms always welcome,