Word.sc - Online Dictionary From Your Toolbar

Word Source is like Dictionary.com, an online dictionary and thesaurus, with one distinguishing twist -- you can access the tool from your browser. All you have to do is enter word.sc/(and then input the word you want here) and it does the search. Pretty easy. You can also add Word Source to your browser from the site, making it still more easy. As always, I appreciate sites with a simple purpose and little fanfare. This is such a site.

The Online Dictionary is Reborn. Never leave your browser"s address bar. Go to www.word.sc/(insert word here).

Everyone needs both a dictionary and thesaurus at their fingertips, and this site literally puts it right there. They are also generating decent traffic.

How are they competing against the stalwart Dictionary.com? How are they making a profit?