Here is a tiny new Emacs major mode for browsing local WordNet lexical database: https://github.com/gromnitsky/wordnut
I was very surprised not to find an abundance of similar modes in the wild.
Its most useful features are:
- Completions. For example, do M-x wordnut-search RET arc TAB.
- Pressing Enter in *WordNut* buffer inside any word. In this way you can browse the WordNet db indefinitely.
- History. Keybindings are very usual: `l' to go back, `r' to go forward.