shout vs let loose

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

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

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

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

shout (noun)	let loose (noun)
a loud utterance; often in protest or opposition

shout (verb)	let loose (verb)
utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)	express audibly; utter sounds (not necessarily words)
utter a sudden loud cry	turn loose or free from restraint
utter aloud; often with surprise, horror, or joy
use foul or abusive language towards