I often misspell words. macOS will show me that I've misspelled a word, but it does a bad job of guessing what I was trying to spell.
This macOS Service menu item simply searches for a highlighted word online – so that you can (hopefully) copy the correct spelling from google.

- Clone/download it
- Open
SpellCheckService.xcodeproj
in Xcode - Build and run (cmd+R) the app once in Xcode to register the service with macOS
- Quit the running app/quit Xcode
- Restart your Mac
- See the screenshot above for how to use it