You can look up two-word phrases on Touch and Paperwhite. If the phrase or compound word you attempt is not in the dictionary, however, then it won't give you any sign that it tried a lookup--it will just prompt you to do a highlight as NiLuJe mentioned.
It takes some searching to find cases where it works. I just did a test, and was able to look up the following words on the Paperwhite with Merriam-Webster's Collegiate set as default:
machine gun
Middle Ages
United Kingdom
Burkina Faso
New York
automatic pilot
Ice Age
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