let go of vs let loose

let go of and let loose both are verbs.

Word	Noun	Adjective	Verb	Adverb
let go of	No	No	Yes	No
let loose	No	No	Yes	No

As verbs, let loose is a hyponym of let go of; that is, let loose is a word with a more specific, narrower meaning than let go of:

let go of (verb)	let loose (verb)
release, as from one's grip	express audibly; utter sounds (not necessarily words)
	turn loose or free from restraint