Danke.. Unfortunately, the software I used is very simple and only gives me the actual word count if I go and click word by word .. I'd take ages with this tool to get a word count....

What I really had in mind was doing something similar but based on social network traffic such as twitter, facebook and so on, just to see what could be retrieved in relation to Bitcointalk. The idea was to treat the forum as a brand and see what the associated word cloud looked like. This is often done in marketing, along with obtaining the sentiment, temperature and tone of the related flowing messages for example.
Alas, what I found around for free didn't convince me, and it was rather partial and thus non-representative. These kind of studies can be performed by social media agencies, but I lack direct access to the tools.

Another interesting thing to do would be to do the same as in the OP but going in deeper: not just Subject name as I have done, but going in to the actual threads and getting their content too. That, from outside the forum software, is too cumbersome to do too, but conceptually interesting.