zip up vs zip

zip up is not a noun while zip is a noun.

Word	Noun	Adjective	Verb	Adverb
zip up	No	No	Yes	No
zip	Yes	No	Yes	No

As verbs, zip up and zip are synonyms defined as:

Other synonyms of zip up include zipper.

zip up (noun)	zip (noun)
	a fastener for locking together two toothed edges by means of a sliding tab
	forceful exertion
	a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential

zip up (verb)	zip (verb)
close with a zipper	close with a zipper
	move very fast