stop up vs insert

stop up is not a noun while insert is a noun.

Word	Noun	Adjective	Verb	Adverb
stop up	No	No	Yes	No
insert	Yes	No	Yes	No

stop up (noun)	insert (noun)
	(film) a still picture that is introduced and that interrupts the action of a film
	(broadcasting) a local announcement inserted into a network program
	an artifact that is inserted or is to be inserted
	a folded section placed between the leaves of another publication

stop up (verb)	insert (verb)
fill or close tightly with or as if with a plug	place, fit, or thrust (something) into another thing
	insert casually
	put or introduce into something
	fit snugly into