What is the drop-down thesaurus?

The drop-down thesaurus is a feature that allows users to click on an individual word or phrase and replace it with a synonym from the given list.

To access this list, simply click on a word or phrase. When you do so, this will show a list of synonyms that you can replace the word with:

Note that you can see the definition of the word in the list by hovering over the arrowhead on the right side of the menu: