divide vs unitize

divide is a noun but unitize is not a noun.

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

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

divide (noun)	unitize (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)	unitize (verb)
perform a division	separate or classify into units
move or break apart	make into a unit
force, take, or pull apart	divide (bulk material) and process as units
make a division or separation
separate into parts or portions
act as a barrier between; stand between