Use the Word Cloud
"Discover" refers to the word cloud located in the left pane of the screen. It is a starburst of suggestions which are associated with the word(s) that you've searched. You can see the search term in the middle of the cloud, in this example "mercury".
Many words have different meanings in different contexts. If you search for “mercury”, do you want to find items about the planet, the Roman god, the space program, or the car? The Discover Word Cloud helps you browse among related terms for the different meanings of the search word(s).
Red words are somehow associated with the term you entered. Mercury is the car model, made by "ford", and manuals for the car use "repair" and"chilton". The space program uses the terms "mission", "control" and "project". The planet is often paired with "venus", and so on.
Green words have the same definition as your search term.
Purple words are other possible versions of the word, often changing from single to plural.
Once you click on one of these words, on the next page, you will see your previous search term appear in the word cloud in blue. This 'breadcrumb' allows you to retrace your path in the cloud.