press run vs split run

press run and split run both are nouns.

Word	Noun	Adjective	Verb	Adverb
press run	Yes	No	No	No
split run	Yes	No	No	No

As nouns, split run is a hyponym of press run; that is, split run is a word with a more specific, narrower meaning than press run:

press run: the period that presses run to produce an issue of a newspaper
split run: a print run of a newspaper during which some articles or advertisements are changed to produce a different edition

press run (noun)	split run (noun)
the period that presses run to produce an issue of a newspaper	a print run of a newspaper during which some articles or advertisements are changed to produce a different edition