gurgle vs let loose

gurgle is a noun but let loose is not a noun.

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

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

Other hypernyms of gurgle include emit, let out, utter.

gurgle (noun)	let loose (noun)
the bubbling sound of water flowing from a bottle with a narrow neck

gurgle (verb)	let loose (verb)
utter with a gurgling sound	express audibly; utter sounds (not necessarily words)
drink from a flask with a gurgling sound	turn loose or free from restraint
flow in an irregular current with a bubbling noise
make sounds similar to gurgling water