You need to use google adwords tool to check the global and local monthly searches against various keywords and also note the level of competition specified by google adwords. Choose the keywords with minimum competition and maximum searches.
When using Google Keyword Suggestion Tool it also gives you an abundance of synonyms. People will type in many combinations to search for a product or service. This is Googles way to track and give you these keywords as suggestions to try out.
Why not you are trying for word tracker that is that is the best keyword research tool to get oriented and relevant search for your business. Though it is paid, If your budget is not allowing to do so, Its better to use ad word tool that is also the best tool in this regard.