Choosing the right phrases—the synonym tool...
Understanding keywords is important, but more important is understanding what people are searching for? A major part of that includes finding out the variations of keywords that show up in searches all the time. SEO analysts sometimes even advice people to target the right synonyms of their business areas, instead of the main keyword (and they aren’t kidding).
This is especially true when one is trying to optimize businesses that are found in the Google local listings. Lots of people searching there search with descriptions and sometimes categories of business. Understanding those categories and phrases is key to ranking well in the maps.
Look at the Categories above, it is sometimes important to know the right category, than what you think is the right category for you.
On the same lines, Mike Blumenthal has put together a great tool for searching the right keywords/synonyms. The synonyms are taken from the Google’s database and provide great value to SEO analysts and local seo experts.
The search clearly highlights the most searched synonyms for the main keyword. Play around with it and let me know how useful you find it.

