initialize vs split up

initialize is not a noun while split up is a noun.

Word	Noun	Adjective	Verb	Adverb
initialize	No	No	Yes	No
split up	Yes	No	Yes	No

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

Other hypernyms of initialize include carve up, dissever, divide, separate, split.

initialize (noun)	split up (noun)
	an increase in the number of outstanding shares of a corporation without changing the shareholders' equity

initialize (verb)	split up (verb)
divide (a disk) into marked sectors so that it may store data	become separated into pieces or fragments
assign an initial value to a computer program	get a divorce; formally terminate a marriage
	discontinue an association or relation; go different ways
	separate into parts or portions