spring vs let out

spring is a noun but let out is not a noun.

Word	Noun	Adjective	Verb	Adverb
spring	Yes	No	Yes	No
let out	No	No	Yes	No

As verbs, let out is a hypernym of spring; that is, let out is a word with a broader meaning than spring:

spring: produce or disclose suddenly or unexpectedly
let out: make known to the public information that was previously known only to a few people or that was meant to be kept a secret

Other hypernyms of spring include break, bring out, disclose, discover, divulge, expose, give away, let on, reveal, uncover, unwrap.

spring (noun)	let out (noun)
a light, self-propelled movement upwards or forwards
a metal elastic device that returns to its shape or position when pushed or pulled or pressed
the elasticity of something that can be stretched and returns to its original length
a point at which water issues forth
a natural flow of ground water
the season of growth; spring; the beginning of spring

spring (verb)	let out (verb)
develop suddenly	make (clothes) larger
produce or disclose suddenly or unexpectedly	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
spring back; spring away from an impact	express audibly; utter sounds (not necessarily words)
move forward by leaps and bounds	bring out of a specific state
develop into a distinctive entity