General purpose open source taxonomy database

Question

I am looking for a database which could help me group thousands of English-language keywords to few general disciplines.

For example:

I HAVE THIS => I WANT TO HAVE THIS
cat => animal
chair => household
wine => drink
deer => animal
beer => drink
glass => household, drink
total 50 000 keywords => total <100 disciplines

I guess that organizing keywords into disciplines can be very tricky. I don't really care about what will be the disciplines. I only want to have my 50 000 keywords grouped into less than 100 disciplines.

Do you know a dictionary database that can do that?