Well, my last scope was a dictionary, it seems only natural that the next one would be a thesaurus, right? It’s building in scopes-packagers/ppa as we speak, and should be available for downloading and testing soon. This uses the same api as the dictionary scope, but gives you a list of synonyms, as well as a list of antonyms.
As always, testers are appreciated, any issues shoot me an email at firstname.lastname@example.org.
sudo add-apt-repository ppa:scopes-packagers/ppa
sudo apt-get update
sudo apt-get install unity-scope-thesaurus