let out vs emit

let out and emit both are verbs.

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

As verbs, let out and emit are synonyms defined as:

Other synonyms of let out include let loose, utter.

let out (verb)	emit (verb)
make (clothes) larger	expel (gases or odors)
make known to the public information that was previously known only to a few people or that was meant to be kept a secret	express audibly; utter sounds (not necessarily words)
express audibly; utter sounds (not necessarily words)	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
bring out of a specific state