Wow, I had this exact question this morning and was about to post something similar. In my case, the question was: say you know the beginning of a search phrase

Wow, I had this exact question this morning and was about to post something similar. In my case, the question was: say you know the beginning of a search phrase someone may use and you want to target long-tail variations of it, how could you rank the possibilities in order to start targeting from largest "market" to smallest. In your case, if you knew a keyword that the professional is looking for, I believe our problem is the same one. For example, say you wanted to focus on wordpress templates. The set of possibilities of what type of template someone may want is open ended. ("Wordpress template for doctors", "wordpress templates fishing website", etc). I've tried using Google's Adword tool, but it doesn't quite do what I need, unless I'm missing something. Anyone have any ideas?