How many terms can I compare? And what other functionality is available?

6. How many terms can I compare? And what other functionality is available?

You can compare up to five terms by separating each one with a comma. For example, to compare “boots” and “sneakers”, simply enter boots, sneakers and click Search Trends.
To see how many searches contained either term, list them and separate with a vertical bar ( | ):
boots | sneakers
To see how many searches were done for either “snow boots” or “sneakers”, use parentheses around the multi-word term: (snow boots) | sneakers.
You can also exclude terms from your search by using the minus sign. For instance, to see how many searches contained the term “boots” but not “hiking”, enter boots-hiking.
To restrict your results to only those searches that contain your terms in the specific order you’ve entered them, you can put your terms in quotation marks: "snow boots". (By default, Google Trends will show you all searches that contain the terms you entered in any order.)
Note that when you use any of these advanced features – quotation marks, minus signs, or vertical bars – Trends will only display the Search Volume Index graph. The news portion doesn’t support advanced functionality at this time.