stack up vs collect

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

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

As verbs, collect is a hypernym of stack up; that is, collect is a word with a broader meaning than stack up:

Other hypernyms of stack up include garner, gather, pull together.

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

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

stack up (verb)	collect (verb)
arrange into piles or stacks	assemble or get together
	get or bring together
	get or gather together
	call for and obtain payment of
	gather or collect

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