fragmentise vs split up

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

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

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

Other hypernyms of fragmentise include break, come apart, fall apart, separate.

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

fragmentise (verb)	split up (verb)
break or cause to break into pieces	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