splinter vs break up

splinter is a noun but break up is not a noun.

Word	Noun	Adjective	Verb	Adverb
splinter	Yes	No	Yes	No
break up	No	No	Yes	No

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

Other hypernyms of splinter include fragment, fragmentise, fragmentize.

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

Other hypernyms of splinter include break, part, separate, split, split up.

splinter (noun)	break up (noun)
a small thin sharp bit of wood or glass or metal

splinter (verb)	break up (verb)
break up into splinters or slivers	laugh unrestrainedly
withdraw from an organization or communion	break or cause to break into pieces
divide into slivers or splinters	come to an end
	separate (substances) into constituent elements or parts
	cause to go into a solution
	cause to separate
	close at the end of a session
	bring the association of to an end or cause to break up
	make a break in
	set or keep apart
	break violently or noisily; smash
	attack with or as if with a pickaxe of ice or rocky ground, for example
	release ice
	destroy the completeness of a set of related items
	take apart into its constituent pieces
	suffer a nervous breakdown
	disband
	to cause to separate and go in different directions
	discontinue an association or relation; go different ways