sa stands for Synonym Antonym
sa is command line utility that retrieves word synonyms, antonyms and definition from thesaurus.com and presents it clearly.
Install:
apt-get install w3m
git clone https://github.com/greg-sk/thesaurus-synonyms.git
cd thesaurus-synonyms
sudo ln -s `pwd`/sa /usr/local/bin/sa
Usage:
sa <word or phrase> - show synonym and antonym list
sa - show word origin and example sentences of the last retrieved entry