hot spring vs outpouring

hot spring and outpouring both are nouns.

Word	Noun	Adjective	Verb	Adverb
hot spring	Yes	No	No	No
outpouring	Yes	No	No	No

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

Other hypernyms of hot spring include fountain, natural spring, outflow, spring.

hot spring (noun)	outpouring (noun)
a natural spring of water at a temperature of 70 F or above	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