Words: Word list and word cloud
The view Words (option of the tab/button Analyze) shows you the words which are contained in the most documents of the results of your search context:
The number shows you how many documents (matching your search query and filters or if no search query or filter of all documents) use this word.
If you click on a word, this word will be added as an additional filter.
The words are visualiszed as a word cloud. The more documents containing the word, the bigger it is in the visualization