This tool shows where your page ranks for it's most common terms.

Common Word Google Search Ranking Postion Tool
Find Common Words
Enter the domain or URL of your website to see which are the words
most often used on the page and how well they rank in Google.*

URL of your website: http:// Top keywords

* Most webmasters would be better off trying to rank for phrases rather than individual words.
I did not create this tool, but if I did I would looked for the most common phrases,
and would have the option to cross reference it with something like our Free Keyword Suggestion Tool.

In the second step of using this tool you can change the
words searched for to be your most commercially viable keyword phrases instead of
searching for random short words appearing in your page copy like hat, cat, or a rat.