TheRarestWords is an interesting Russian-developed project that seems to have the goal of optimizing search engine results by pulling out the rarest words on any given site. Basically, TheRarestWords bot scours the internet, examines words on URLs and then lists off the rarest words found on each site.
The thinking behind this appears to be that having rarely used words will help you be found faster when people type in those exact words into their search. The homepage of TheRarestWords allows you to scan through the sites that the bot has visited and then write up a one-hundred character definition of any of these words. The idea behind this is that by defining the word, it will give it an edge in future semantic search endeavors. There are a number of other options on the site and it takes a bit of reading to understand it well, but it is worth a visit.
TheRarestWords.com In Their Own Words
“It’s a crowd fun! Click and edit! Yes, you! See the words? Those are the rarest (AND popular – in each category) words, found at that site. Now, see box under it? Write what you know about that word! Let the people see it. If you see something you don’t like… Write something better in place of it!”
Why TheRarestWords.com It Might Be A Killer
This is an interesting project but it is still unclear what ramifications it might have to the search industry. It could certainly be used to improve current semantic search projects since it has users define rare words. It could also be used to track current trends or buzzwords and whether they are gaining or losing popularity.
Some Questions About TheRarestWords.com
This would appear to just be a fun project at the moment and therefore the lack of a business model is not necessarily a concern. Will they be expanding the reach of the bot so that it searches deeper on each page? Could they add the functionality that allows users to search for most popular words? 
