onslaught vs outpouring

onslaught and outpouring both are nouns.

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

As nouns, onslaught and outpouring are synonyms defined as:

onslaught and outpouring: the rapid and continuous delivery of linguistic communication (spoken or written)

Other synonyms of onslaught include barrage, bombardment.

onslaught (noun)	outpouring (noun)
(military) an offensive against an enemy (using weapons)	a large flow
the rapid and continuous delivery of linguistic communication (spoken or written)	the rapid and continuous delivery of linguistic communication (spoken or written)
a sudden and severe onset of trouble	the pouring forth of a fluid
	a sudden rapid flow (as of water)
	a natural flow of ground water