divide vs rupture

divide and rupture both are nouns.

Word	Noun	Adjective	Verb	Adverb
divide	Yes	No	Yes	No
rupture	Yes	No	Yes	No

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

divide (noun)	rupture (noun)
a ridge of land that separates two adjacent river systems	the act of making a sudden noisy break
a serious disagreement between two groups of people (typically producing tension or hostility)	a personal or social separation (as between opposing factions)
	state of being torn or burst open

divide (verb)	rupture (verb)
perform a division	separate or cause to separate abruptly
move or break apart
force, take, or pull apart
make a division or separation
separate into parts or portions
act as a barrier between; stand between