divide vs break up

divide is a noun but break up is not a noun.

Word	Noun	Adjective	Verb	Adverb
divide	Yes	No	Yes	No
break up	No	No	Yes	No

As verbs, break up is a hyponym of divide; that is, break up is a word with a more specific, narrower meaning than divide:

As verbs, break up is a hyponym of divide; that is, break up is a word with a more specific, narrower meaning than divide:

As verbs, break up is a hyponym of divide; that is, break up is a word with a more specific, narrower meaning than divide:

Other hyponyms of divide include partition, zone, break, dispel, disperse, dissipate, scatter, rail, rail off, detach, close off, shut off.

divide (noun)	break up (noun)
a ridge of land that separates two adjacent river systems
a serious disagreement between two groups of people (typically producing tension or hostility)

divide (verb)	break up (verb)
perform a division	laugh unrestrainedly
move or break apart	break or cause to break into pieces
force, take, or pull apart	come to an end
make a division or separation	separate (substances) into constituent elements or parts
separate into parts or portions	cause to go into a solution
act as a barrier between; stand between	cause to separate
	close at the end of a session
	bring the association of to an end or cause to break up
	make a break in
	set or keep apart
	break violently or noisily; smash
	attack with or as if with a pickaxe of ice or rocky ground, for example
	release ice
	destroy the completeness of a set of related items
	take apart into its constituent pieces
	suffer a nervous breakdown
	disband
	to cause to separate and go in different directions
	discontinue an association or relation; go different ways