let out vs let go

let out and let go both are verbs.

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

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

Other hypernyms of let out include let go of, release, relinquish.

let out (verb)	let go (verb)
make (clothes) larger	release, as from one's grip
make known to the public information that was previously known only to a few people or that was meant to be kept a secret	be relaxed
express audibly; utter sounds (not necessarily words)
bring out of a specific state