LIST: Choose this option to see a listing of each individual word or string that matches the query, as well as collocates (nearby words). (More information on types of search strings). See the list display for a most ADJ NOUN.
CHART: This option presents "bar charts" that indicate the overall frequency for all matching words or phrases in each decade of the corpus. See the chart for a most ADJ NOUN.
COMPARE WORDS: This allows you to compare the collocates (nearby words) for two different words, such as small / little, or start / begin, which provides insight into the difference in meaning or use of these two words. This option -- which is available with all of the other corpora -- may be added for the Google Books corpus as well in the next few months.