let loose vs emit

let loose and emit both are verbs.

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

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

let loose and emit: express audibly; utter sounds (not necessarily words)

Other synonyms of let loose include let out, utter.

let loose (verb)	emit (verb)
express audibly; utter sounds (not necessarily words)	expel (gases or odors)
turn loose or free from restraint	express audibly; utter sounds (not necessarily words)
	give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.