outflow vs formation

outflow and formation both are nouns.

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

As nouns, formation is a hypernym of outflow; that is, formation is a word with a broader meaning than outflow:

Other hypernyms of outflow include geological formation.

outflow (noun)	formation (noun)
the discharge of a fluid from some container	the act of fabricating something in a particular shape
a natural flow of ground water	the act of forming or establishing something
the process of flowing out	creation by mental activity
	a particular spatial arrangement
	an arrangement of people or things acting as a unit
	(geology) the geological features of the earth
	natural process that causes something to form