zipper vs zip fastener

zipper and zip fastener both are nouns.

Word	Noun	Adjective	Verb	Adverb
zipper	Yes	No	Yes	No
zip fastener	Yes	No	No	No

As nouns, zipper and zip fastener are synonyms defined as:

zipper and zip fastener: a fastener for locking together two toothed edges by means of a sliding tab

Other synonyms of zipper include slide fastener, zip.

zipper (noun)	zip fastener (noun)
a fastener for locking together two toothed edges by means of a sliding tab	a fastener for locking together two toothed edges by means of a sliding tab

zipper (verb)	zip fastener (verb)
close with a zipper