sectionalize vs split up

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

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

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

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

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

sectionalize (verb)	split up (verb)
divide into sections, especially into geographic sections	become separated into pieces or fragments
	get a divorce; formally terminate a marriage
	discontinue an association or relation; go different ways
	separate into parts or portions