outpouring vs outflow

outpouring and outflow both are nouns.

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

As nouns, outflow is a hyponym of outpouring; that is, outflow is a word with a more specific, narrower meaning than outpouring:

Other hyponyms of outpouring include jet, spirt, spurt, squirt, escape, leak, leakage.

As nouns, outpouring and outflow are synonyms defined as:

Other synonyms of outpouring include fountain, natural spring, spring.

outpouring (noun)	outflow (noun)
a large flow	the discharge of a fluid from some container
the rapid and continuous delivery of linguistic communication (spoken or written)	a natural flow of ground water
the pouring forth of a fluid	the process of flowing out
a sudden rapid flow (as of water)
a natural flow of ground water