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You can also test different user agents. The key here is to test changes before going live with a new robots.txt
Pretty cool feature!
There are a couple of words in that list that I know I used (intentionally) but I'm surprised they made the list. I don't think they are the most frequently used words.
I was confused (and concerned) because the page said I didn't have a robots.txt ("We didn't find a robots.txt file on your site.") even though I have one. Finally I discovered that clicking the "Check" button forces the utility to load the robots.txt file. The page is displaying information based on the tool's downloading of robots.txt, not Google's bots.