Lee's answer is correct. I just wanted to add that "unzip" is to open a zipper, while "zip" is usually meant to mean "close a zipper." Also, "zip" as a verb has the separate meaning of "to move quickly", although it's not used that frequently.
July 7, 2015
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zip is verb; zipper is a noun.
July 7, 2015
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Zip = British English
Zipper = American English
August 29, 2018
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