I was browsing the net and found this website. You find vocabulary (topics) in many languages. What I found most interesting is that you can also contribute.  One disadvantage(?) is that you have to download the software if you want to contribute, but without downloading anything you may still use some useful tools.

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Here is the link, I hope you find it interesting and useful: http://www.vocab.co.uk/index.htm

 

Best wishes