run over vs overflow

run over is not a noun while overflow is a noun.

Word	Noun	Adjective	Verb	Adverb
run over	No	No	Yes	No
overflow	Yes	No	Yes	No

As verbs, run over and overflow are synonyms defined as:

Other synonyms of run over include brim over, overrun, well over.

run over (noun)	overflow (noun)
	a large flow
	the occurrence of surplus liquid (as water) exceeding the limit or capacity

run over (verb)	overflow (verb)
injure or kill by knocking (someone or something) down and passing over the body, as with a vehicle	overflow with a certain feeling
flow or run over (a limit or brim)	flow or run over (a limit or brim)