As you click on "RANDOM" in the search
form, it will find a random word
from the top 60,000 words in the corpus and then insert
this into the search form. This is a great way to just kind of browse
through the corpus and find new and interesting words. You can also
focus on a certain range
of words, e.g. words #4000-4500 or 30,000-40,000.