split down vs decrease

split down and decrease both are nouns.

Word	Noun	Adjective	Verb	Adverb
split down	Yes	No	No	No
decrease	Yes	No	Yes	No

As nouns, decrease is a hypernym of split down; that is, decrease is a word with a broader meaning than split down:

split down: a decrease in the number of outstanding shares of a corporation without changing the shareholders' equity
decrease: the act of decreasing or reducing something

Other hypernyms of split down include diminution, reduction, step-down.

split down (noun)	decrease (noun)
a decrease in the number of outstanding shares of a corporation without changing the shareholders' equity	the act of decreasing or reducing something
	the amount by which something decreases
	a change downward
	a process of becoming smaller or shorter

split down (verb)	decrease (verb)
	decrease in size, extent, or range
	make become smaller