gather up vs collect

gather up is not a noun while collect is a noun.

Word	Noun	Adjective	Verb	Adverb
gather up	No	No	Yes	No
collect	Yes	Yes	Yes	Yes

As verbs, gather up and collect are synonyms defined as:

Other synonyms of gather up include call for, pick up.

gather up (noun)	collect (noun)
	a short prayer generally preceding the lesson in the Church of Rome or the Church of England

gather up (adjective)	collect (adjective)
	payable by the recipient on delivery

gather up (verb)	collect (verb)
take and lift upward	assemble or get together
gather or collect	get or bring together
	get or gather together
	call for and obtain payment of
	gather or collect

gather up (adverb)	collect (adverb)
	make a telephone call or mail a package so that the recipient pays