volley vs let out

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

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

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

Other hypernyms of volley include emit, let loose, utter.

volley (noun)	let out (noun)
rapid simultaneous discharge of firearms
a tennis return made by hitting the ball before it bounces

volley (verb)	let out (verb)
utter rapidly	make (clothes) larger
make a volley	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
discharge in, or as if in, a volley	express audibly; utter sounds (not necessarily words)
hit before it touches the ground	bring out of a specific state
be dispersed in a volley