Here's a wordle from our Geoportal Server sandbox. Wordles can be generated from an ATOM feed and Geoportal Server support that in its REST interface:
And here is one from Geo.data.gov using the same query:
Difference is interesting. Geo.data.gov just had reharvested several thousand USGS quadsheets. the variety in words in significantly less compared to the Geoportal sandbox one and the words all seem to occur about the same number of times. This is because the metadata for the quadsheets is generated.
Take a different perspective on something once in a while. You might learn something.