round up vs collect

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

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

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

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

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

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

round up (verb)	collect (verb)
seek out and bring together	assemble or get together
	get or bring together
	get or gather together
	call for and obtain payment of
	gather or collect

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