overrun vs run out

overrun is a noun but run out is not a noun.

Word	Noun	Adjective	Verb	Adverb
overrun	Yes	No	Yes	No
run out	No	No	Yes	No

As verbs, run out is a hypernym of overrun; that is, run out is a word with a broader meaning than overrun:

Other hypernyms of overrun include spill.

overrun (noun)	run out (noun)
too much production or more than expected

overrun (verb)	run out (verb)
run beyond or past	use up all one's strength and energy and stop working
seize the position of and defeat	prove insufficient
flow or run over (a limit or brim)	exhaust the supply of
invade in great numbers	become used up; be exhausted
occupy in large numbers or live on a host	flow, run or fall out and become lost
	flow off gradually
	leave suddenly and as if in a hurry
	lose validity