I'm looking for a Keyword software that will generate a massive list (probably over 100,000+ keywords) from a single keyword. The software must only focus on this one keyword. This is a broad example but this is the best way I can explain it if I type in the letter "a" it would return all the keywords that contain the letter "a". I don't want the service to use the existing list and build onto. From the example above it it returned the keyword "Apple" I don't want it to use this keyword to add on to the list, I just want it to focus on the letter "a". If it uses MSN adcenters data that would be amazing too!