The words cloud shows you the most used keywords within your results. It correspond to the Topic KPI that you can find in the Mention analytics features.
The more often a term is mentioned in your results, the bigger it appears in your word cloud. Get your mouse close to a word, and get the statistics behind it.
Additional Tip: You can also apply filters to see topics within specific Sources or for a selected Sentiment and more.
If you can't see any data, try to change the default time frame at the top of the listening dashboard.