outpouring vs overflow

outpouring and overflow both are nouns.

Word	Noun	Adjective	Verb	Adverb
outpouring	Yes	No	No	No
overflow	Yes	No	Yes	No

As nouns, outpouring and overflow are synonyms defined as:

Other synonyms of outpouring include flood.

outpouring (noun)	overflow (noun)
a large flow	a large flow
the rapid and continuous delivery of linguistic communication (spoken or written)	the occurrence of surplus liquid (as water) exceeding the limit or capacity
the pouring forth of a fluid
a sudden rapid flow (as of water)
a natural flow of ground water

outpouring (verb)	overflow (verb)
	overflow with a certain feeling
	flow or run over (a limit or brim)