This database collects words with their lexical relationships. There's a clickable dictionary with hyponyms, hypernyms, synonyms, and other lexical relationships. You can even get a hypernym tree which builds all the way up to 'existence' or 'entity'. Click the bottom link for info about the page, or try this link for a test example: http://wordnetweb.princeton.edu/perl/webwn?o2=&o0=1&o8=1&o1=1&o7=&o5=&o9=&o6=&o3=&o4=&s=Test&i=7&h=1100000010000000000000000#c
http://wordnet.princeton.edu/
