leakage vs outpouring

leakage and outpouring both are nouns.

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

As nouns, outpouring is a hypernym of leakage; that is, outpouring is a word with a broader meaning than leakage:

Other hypernyms of leakage include discharge, run.

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