trumpet vs let out

trumpet is a noun but let out is not a noun.

Word	Noun	Adjective	Verb	Adverb
trumpet	Yes	No	Yes	No
let out	No	No	Yes	No

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

Other hypernyms of trumpet include emit, let loose, utter.

trumpet (noun)	let out (noun)
a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves

trumpet (verb)	let out (verb)
proclaim on, or as if on, a trumpet	make (clothes) larger
utter in trumpet-like sounds	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
play or blow on the trumpet	express audibly; utter sounds (not necessarily words)
	bring out of a specific state