split decision vs decision

split decision and decision both are nouns.

Word	Noun	Adjective	Verb	Adverb
split decision	Yes	No	No	No
decision	Yes	No	No	No

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

split decision (noun)	decision (noun)
a boxing decision in which the judges are not unanimous	the act of making up your mind about something
	the trait of resoluteness as evidenced by firmness of character or purpose
	a position or opinion or judgment reached after consideration
	the outcome of a game or contest
	(boxing) a victory won on points when no knockout has occurred