gargle vs let loose

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

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

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

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

gargle (noun)	let loose (noun)
the sound produced while gargling
a medicated solution used for gargling and rinsing the mouth

gargle (verb)	let loose (verb)
rinse one's mouth and throat with mouthwash	express audibly; utter sounds (not necessarily words)
utter with gargling or burbling sounds	turn loose or free from restraint