geyser vs outflow

geyser and outflow both are nouns.

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

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

Other hypernyms of geyser include fountain, natural spring, outpouring, spring.

geyser (noun)	outflow (noun)
a spring that discharges hot water and steam	the discharge of a fluid from some container
	a natural flow of ground water
	the process of flowing out

geyser (verb)	outflow (verb)
to overflow like a geyser